science experiments for physics

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80 of the Best Physics Projects for Clever Kids

February 21, 2020 by Ana Dziengel Leave a Comment

Physics projects are some of the most memorable science projects your kids will ever try. There, I said it even if you don’t believe it!

You see, physics is the branch of science that studies flying, launching, moving, and floating, as well as magnets, motors and electrical circuits, heat, light, and sound. Physics is fun! After you look over some of the projects in this collection I hope you’ll agree.

Now before we begin I want to address a common notion a lot of folks have about this branch of science: Physics is really hard! I completely understand this thought.

In fact the only class I ever almost failed in my entire academic career was physics. And I know why. Physics was presented to me as formulas about force, equilibrium, and momentum with not one single demonstration. Then I walked into a structural engineering class where we discussed the forces at work in designing buildings and my teacher told us he didn’t want us to open a book all quarter. Instead he told us to build models. He wanted us to experiment with how forces really interact in a structure by testing them in hands-on experiments. It was a profound experience for me and suddenly all the book learning “clicked.”

My goal with this collection of projects is to make physics more accessible and inviting to parents, teachers, and kids alike! But before we dive into the physics projects let’s get a bird’s eye view of what physics is all about!

What is the study of physics?

Physics is the branch of science that studies matter, how it moves and how it interacts. It is a HUGE topic and there is a lot of overlap with chemistry and biology. It’s really easy to hear the word physics and have your eyes glaze over, but in simple words physics is the study of how things move and interact with each other.

How do you explain physics to a child?

The best way to explain physics to kids is to skip an explanation and do a demonstration . Since physics encompasses the study of motion, light, electricity, magnetism, and aerodynamics, instead of trying to explain these concepts demonstrate them! I am a big believer in hands-on projects that give kids a chance to experience and experiment with a scientific concept rather than just hear or read about it. We all know an amazing project is memorable while a wordy explanation is forgettable. Kids are great visual learners so give them the chance to get excited about physics through projects!

What are main branches of Physics?

While I was assembling this post I realized scientists define the branches of physics in many different ways. The following is a list of the most commonly cited branches of physics compiled from both online and offline resources:

• Mechanics This includes force, motion, fluid and aerodynamics, and is the branch most people think of when they hear the word physics.
• Electromagnetism Electricity is physics!

Thermodynamics

• Sound and Waves
• Quantum Mechanics This is for the very serious! It’s the branch that studies atomic particles.

80+ Physics Projects for Kids

How to use this guide.

The physics projects for kids featured here are sorted by branches of physics and subcategories as follows (click on the topic to skip to that section) :

• Mechanics and Motion: Work & Energy, Newton’s Law’s of Motion, Radial Forces, Gravity, and Balance
• Electromagnetism & Electricity: Magnetism, Electricity

Optics & Sound

• Heat, Liquids, and Air: Thermodynamics, Hydrodynamics, & Aerodynamics

Some topics and categories were really easy to find great projects for (work and energy) some were more challenging (thermodynamics) and at least one impossible (Quantum mechanics, but that’s okay!). We tried to assemble as many as we could on this list!

Please note that many of these projects could fit in two or more categories as they demonstrate various principles and forces. I only classified them once on this list.

Mechanics and Motion

When most people think of physics they think about mechanics and motion. Mechanics refers to the motion of objects and motion is the position change of an object over time. Everything around us is constantly in motion. Even when we consider ourselves to be sitting still, the earth is rotating on its axis and moving around the sun.

Scientists have studied motion over the centuries and determined there are laws that can explain the motion of objects. These laws revolve around the idea of forces .

A force is something that pushes or pulls on an object to make it move. A force can make an object speed up (like kicking a ball) or or slow down (like friction) or hold an object in place (like gravity). Momentum is the force an object has based on its weight and motion. For a deeper look into forces go here .

In this section we’ll cover projects that focus on motion including 3 of the most famous laws of motion as outlined by Sir Isaac Newton.

Work and Energy Projects

Energy is defined as the ability to do work. Work refers to the amount of energy needed to move something over a distance using a force. The Law of Conservation of Energy states that energy is never created or destroyed it is simply changed from one state to another.

Potential Energy vs. Kinetic Energy

Two types of energy frequently disucssed in phyiscs are kinetic energy and potential energy. Kinetic energy is energy in motion. Potential energy is energy that is stored. An example of potential enrgy is a rubber band twisted up and held in place. Once the rubber band is released it unwinds quickly as kinetic energy.

Here are some projects that demonstrate work and energy:

Physics Project Idea: Rollback Can

Steam activity: stixplosions, how to build a catapult, transfer of energy science experiment, catapult stem project – diy catapult for kids, how to make a windmill model with a printable pattern, simple machines for kids: lego pulleys stem building challenge, power up your planes with a paper airplane launcher, featured work & energy videos:, newton's laws of motion.

Sir Isaac Newton was a mathematician and scientist who studied motion in the 1600's. He is credited with discovering the force of gravity as well as developing three laws of motion to describe how objects move. We'll look at each law of motion and some projects that highlight them below.

Newton's First Law of Motion is called the Law of Interia and states: An object at rest tends to stay as rest and an object in motion tends to stay in motion unless acted upon by an external force.

Newton's Second Law of Motio n states that the acceleration of an object depends on the force applied to the object and the object's mass. The relationship can be described with the following formula: F=ma

Force= Mass x Acceleration

Newton's Third Law of Motion states: For every action there is an equal and opposite reaction.

Here are some projects that focus on the laws of motion:

How To Make A Simple Newton's Cradle

Easy inertia science experiments with pennies, inertia zoom ball: super fun s.t.e.a.m. project, make a balloon pinwheel science demonstration, physics activities that explore newton's laws of motion, radial forces.

Kids love things that spin! There are several types of forces and movement that act upon objects as they spin:

Angular Momentum The momentum of an object rotating around a point.

Centripetal Force A force that pulls an object towards the center point, causing it to move in a circular path. The force is always orthogonal to the fixed center.

Centrifugal Force A force that pushes away from the center as an object is spinning. It's not a REAL force but an apparent force.

Friction is a force that slows down objects sliding against each other. It's the reason that spinning tops eventually slow down. If there was no friction on between the point on which a top spins and the surface on which it is spinning, it would spin forever!

Action Art: Spin Art Using a Bike

Diy spin art: art spinners from steam play & learn, simple paper toys: paper tops, homemade toy idea: diy skip-it, diy toys: spinning tops (+ magical disappearing colors), diy toy idea: spin-finite tops, gorgeous spin art hearts painting activity for kids, easy fidget spinner diy (free template) - science fair project idea, halloween science for kids: pumpkin spinning tops, stem toy: penny spinners, featured radial forces videos:.

Gravity is a force that attracts two bodies together. It's also the natural force that pulls everything towards the earth. The greater the mass of an object the more garvitational pull it has.

Scientists measure the acceration of gravity at the Earth's surface at 32 feet per second squared! That means the longer an object is free falling the more it's speed increases (not accounting for air resistance).

Here are some phyics projects for kids that explore the force of gravity and speed:

Recycled DIY Marble Run

Playground sized diy marble run, science & art for kids: salt pendulum.

Substitute paint for the sand to make a painting pendulum!

Drippy Gravity Painting | TinkerLab

Gravity beads experiment, the lincoln high dive, egg drop project with printable recording sheets, preschool science: weight, featured gravity videos:.

In phyiscs we use the word balance to describe a situation in which two forces are equal in magnitude and extered in opposite directions.

See saws and scales are two easy wasy to illustrate the concept of balance to kids. Here are some additonal project ideas:

How to Make a Balance Toy: Balance Hearts STEAM Activity

Diy balance toy & game, awesome earth day activity: make an earth balancer, how to make balance scales for toddlers and preschoolers, easy kid's craft: straw mobile, engineering for kids: twirling twig mobile, featured balance project videos, electromagnetism & electricity.

Did you know that electricity and magnetism are physics topics? Both of these “invisible” forces are some of kids’ favorites to explore through hands-on projects!

Magnetism describes a force that attracts or repels objects that are made of magnetic material.

A magnet is a type of material that attracts iron and produces it's own magnetic field. Magnets have a north and a south pole. If you hold two magnets close to each other and place like poles together the magnets will repel each other. If you place the opposite poles together they will quickly attract each other.

Science and Art for Kids: Magnetic Sculptures

The creepiest slime ever: how to make magnetic slime, 4 easy magnet experiments that will amaze your kids, science for kids: bouncing magnets, steam camp: how to make a magnetic field sensory bottle, how to make a compass - magnetic science experiment for kids, five minute craft: magnet painting, make an aladdin magic flying carpet, traveling magnets, easy science experiments for kids: gravity activity with paperclips, featured magnetism videos, electricity.

Electrical force is a force that causes electically charged bodies to either repel or attract. It's the force that carries electrical current through a wire. There are two types of electrical charges: positive and negative.

Similar to magentism like charges REPEL each other and opposite charges ATTRACT each other.

Here are some fun ways to explore elctriclty with kids.

How to Make Electric Play Dough with Kids

Steam project: tiny dancers (a homopolar motor), simple electronics: how to make a magic wand, how to make dance bots an electronics project for kids, how to make salty circuits: a simple circuit project for kids, how to make a lemon battery and a lime light, how to make a lightning bug paper circuit card, make an electromagnet, science for kids: diy magnetic led lights, static electricity balloon and salt and pepper experiment, steam camp: how to make a modern art steady hand game, origami firefly paper circuits, featured electricity videos.

What we see and hear is determined by physics! This includes the behavior of light waves and sounds waves, those that we can perceive and those we cannot.

Light is a type of energy made up of photons. Our eyes can perceive some of it and some forms we cannot perceive at all. Light travels in both wave form and particle form.

Photons are particles which can transmit light.

Optics is the study of light's behavior as well as tools we use to study and understand it, including how our eyes perceive it.

For a further study of light head over here .

Magic Mirrors: How To Make Reflection Art

Optical illusion toy: decotropes, how to make a teleidoscope (a type of diy kaleidoscope), how to make a microscope with water, magic happens when you pour water into a jar, steam project ideas - zoetrope and benham disk, rainbow science: creating light patterns with a cd, light box - a great tool for exploring the museum, spiral illusion, featured optics videos.

Sound is a vibration that travels in waves and can be detected by the ear. Sound can be transmitted through air, water, and solids.

Here are some projects that make use of sound and vibrations:

Simple Engineering Project: DIY Voicepipe

Explore the science of sound with a diy spinner, how to do the dancing oobleck experiment, sound sandwich, water-bottle membranophone, vibrating snake, how to make a rainstick instrument, rainbow water xylophone - mama.papa.bubba., featured sound videos, heat, liquids, and air.

Physics also covers the study of heat and fluid dynamics which includes aerodynamics (the study of movement in air and gases) and hydrodynamics (the study of movement in liquids) .

Thermodynamics is the branch of physics that studies heat and heat transfer. When two obejcts of different temperatures come in contact, energy will transfer between them until they reach the same temperature and are in a state of equilibrium. Heat always transfers from the higher temperature to a lower temperature. You can read more about heat here.

Heat Sensitive Color Changing Slime

Kids science: flying tea bag hot air balloon, magic jumping coin trick, convection detection, inverted bottles, convection currents, featured thermodynamics videos, hydrodynamics.

Hydrodynamics is the study of how fluids move and behave and the forces they exert. And let's be honest, kids love playing with water so use it an an entree to science!

Magic Potions Density Tower

Make a freestanding diy water wall, science for kids: scupley ships, stem project- build a hydraulic elevator, buoyancy for kids: will it sink or float, science experiments for kids: siphon water coaster, anti-gravity water - sick science, simple machines science lesson: lift water with an archimedes' screw, simple rain gauge, density science for kids : create fireworks in water & oil, featured hydrodynamics videos, aerodynamics.

After playing with water I'd say thay making things fly ranks very high on kids' must try list! Aerodynamics focuses on air movement and the forces at work as objects move through the air. It's the physics branch that let's kids explore building planes, helicopters, and rockets!

How To Make A Paper Helicopter

Diy toy: zappy zoomers, awesome science experiments with hot wheels cars, whirly twirly flying birds, stem for kids: straw rockets (with free rocket template), make an indoor paper boomerang with the kids, straws circle paper planes - s.t.e.m. for kids, how to make awesome paper airplanes 4 designs, more physics for kids resources.

The following websites are terrific resources for more information on the wonderful world of physics! These all offer in depth explanations about the phenomena we touched on above and some of them also offer additional physics projects to try.

• NASA and Newton’s Laws
• Exploratorium
• Physics 4 Kids
• Science 4 Fun

More Science on Babble Dabble Do

There’s lots more science on Babble Dabble Do! Here are some additional projects collections for you to check out:

50+ Chemistry Projects for Kids

30+ science fair projects that will wow the crowd, leave a reply cancel reply.

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Top 5 physics experiments you can do at home

October 17, 2022 By Emma Vanstone Leave a Comment

Physics is key to understanding the world around us. While some aspects may seem tricky to understand, many fundamental physics concepts can be broken down into simple concepts, some of which can be demonstrated using basic equipment at home.

This list of 5 physics experiments you can try at home is a great starting point for understanding physics and, hopefully a source of inspiration for little scientists everywhere!

Physics experiments you can do at home

1. archimedes and density.

The story behind Archimedes’ discovery of density is that he was asked by the King of Sicily to work out whether a goldsmith had replaced some gold from a crown with silver. Archimedes needed to determine if the goldsmith had cheated without damaging the crown.

The crown weighed the same as the gold the King had given the goldsmith, but gold is more dense than silver, so if there were silver in the crown its density would be less than if it were pure gold. Archimedes realised that if he could measure the crown’s volume, he could work out its density, but calculating the volume of a crown shape was a tough challenge. According to the story, Archimedes was having a bath one day when he realised the water level rose as he lowered himself into the bathtub. He realised that the volume of water displaced was equal to the volume of his body in the water.

Archimedes placed the crown in water to work out its density and realised the goldsmith had cheated the king!

Density Experiment

One fun way to demonstrate density is to make a density column. Choose a selection of liquids and place them in density order, from the most dense to the least dense. Carefully pour a small amount of each into a tall jar or glass, starting with the most dense. You should end up with a colourful stack of liquids!

2. Split light into the colours of the rainbow

Isaac Newton experimented with prisms and realised that light is made up of different colours ( the colours of the rainbow ). Newton made this discovery in the 1660s. It wasn’t until the 1900s that physicists discovered the electromagnetic spectrum , which includes light waves we can’t see, such as microwaves, x-ray waves, infrared and gamma rays.

How to split light

Splitting white light into the colours of the rainbow sounds tricky, but all you need is a prism. A prism is a transparent block shaped so light bends ( refracts ) as it passes through. Some colours bend more than others, so the whole spectrum of colours can be seen.

If you don’t have a prism, you can also use a garden hose! Stand with your back to the sun, and you’ll see a rainbow in the water! This is because drops of water act like a prism.

3. Speed of Falling Objects

Galileo’s falling objects.

Aristotle thought that heavy objects fell faster than lighter objects, a theory later disproved by Galileo .

It is said that Galileo dropped two cannonballs with different weights from the leaning tower of Pisa, which hit the ground at the same time. All objects accelerate at the same rate as they fall.

If you drop a feather and a hammer from the same height, the hammer will hit the ground first, but this is because of air resistance!

If a hammer and feather are dropped somewhere with no air resistance, they hit the ground simultaneously. Commander David Scott proved this was true on the Apollo 15 moonwalk!

Hammer and Feather Experiment on the Moon

Brian Cox also proved Galileo’s theory to be correct by doing the same experiment in a vacuum!

While you won’t be able to replicate a hammer or heavy ball and feather falling, you can investigate with two objects of the same size but different weights. This means the air resistance is the same for both objects, so the only difference is the weight.

Take two empty water bottles of the same size. Fill one to the top with water and leave the other empty. Drop them from the same height. Both will hit the ground at the same time!

4. Newton’s Laws of Motion

Sir Isaac Newton pops up a lot in any physics book as he came up with many of the laws that describe our universe and is undoubtedly one of the most famous scientists of all time. Newton’s Laws of Motion describe how things move and the relationship between a moving object and the forces acting on it.

Making and launching a mini rocket is a great way to learn about Newton’s Laws of Motion .

The rocket remains motionless unless a force acts on it ( Newton’s First Law ).

The acceleration of the rocket is affected by its mass. If you increase the mass of the rocket, its acceleration will be less than if it had less mass ( Newton’s Second Law ).

The equal and opposite reaction from the gas forcing the cork downwards propels the rocket upwards ( Newton’s Third Law ).

4. Pressure

Pressure is the force per unit area.

Imagine standing on a Lego brick. If you stand on a large brick, it will probably hurt. If you stand on a smaller brick with the same force it will hurt more as the pressure is greater!

Snowshoes are usually very wide. This is to reduce the pressure on the snow so it sinks less as people walk on it.

Pressure and Eggs

If you stand on one egg, it will most likely break. If you stand on lots of eggs with the same force, you increase the area the force is applied over and, therefore, reduce the pressure on each individual egg.

That’s five easy physics experiments you can do at home! Can you think of any more?

Last Updated on June 14, 2024 by Emma Vanstone

Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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60 Physics Science Experiments For Middle School: Crafts, Investigations, Model Building, And DIYs

January 11, 2024 //  by  Carly Gerson

Physics is a subject that can be difficult for students to understand, so hands-on experiences like experiments are excellent to give your students a better understanding of tricky concepts and theories! Not only do experiments and activities help your kiddos’ understanding but they also create an interactive way to engage them in the learning. Read on to discover 60 phenomenal physics science experiments to try out with your middle school students!

1. Newton’s Cradle

Newton’s Cradle is a classic physics experiment that uses basic materials to demonstrate kinetic energy and potential energy . Your students will love creating their very own version using some string and straws! This is a great way to demonstrate the basic concept of energy transfer in an engaging way.

Learn More: 123 Homeschool 4 Me

2. Simple Bernoulli Experiment

The Bernoulli experiment is an excellent way to teach your kids about air pressure. Show your learners how to use construction paper, tape, a bendy straw, a ping pong ball, scissors, and a pencil to create a fun experiment that they can have a go at! This is a simple way to demonstrate to them how large vehicles like planes can stay high in the air. This abstract concept will be brought to life quickly!

3. Car Science Experiment for Air Resistance and Mass

A physics concept that is sure to be fun to teach your kiddies is the impact of mass on motion! They’ll feel like modern physicists as they place cars with different masses on their race track and time them on their journey! While this may seem like a pretty simple experiment, you can challenge your kids to complete lots of different trials to find out how a range of different factors affects the speed of their cars.

Learn More: Frugal Fun 4 Boys

4. Archimedes’ Screw Simple Machine

Can water flow up? Your kids will be able to answer this question after completing this fun experiment! The Archimedes’ Screw is a commonly known invention that moves water upward and transfers it from one place to another. Help your learners construct their own using a piece of plastic pipe and some clear plastic tubing, then let them experiment and see if they can make it work!

5. Layering Liquids Density Experiment

Children will love participating in this colorful activity. Have your students use different colored liquids to test out the density of each one by creating a density tower! Everyone will watch in amazement as the different colored liquids separate and float to different places in the jar!

Learn More: Green Kid Crafts

6. Launching Easter Eggs Experiment

This activity would make for an incredibly fun science fair project or a great science activity during the Easter season. Using a mini catapult and plastic eggs, your kiddies will have great fun testing how mass impacts the distance traveled by the egg. This experiment will definitely make you smile!

Learn More: STL Motherhood

7. Balloon in a Bottle Properties of Air Experiment

Challenge your learners to put a balloon inside a plastic bottle and blow it up; sounds easy enough, right? They’ll find this one to be a little trickier than they initially thought! As they work to try to blow up their balloons discuss the properties of air which makes this seemingly simple task almost impossible!

Learn More: Steve Spangler Science

8. How to Make a Pendulum Wave

This physics science project is both fun to make and incredible to look at! Using washers and a few other simple materials like string, your students will be captivated by their experiment for hours on end. Besides being completely mesmerized, they’ll also learn about waves and motion.

Learn More: YouTube

9. Creating Catapults

A homemade catapult is a great way to use cheap materials in a STEM project. Have your kiddos use simple household and craft materials to determine which combination makes for the best catapult. You can launch anything from scrunched-up paper to marshmallows! Encourage your middle schoolers to consider how they can scientifically measure which catapult is best!

Learn More: Science Gal

10. Inertia Tower Activity

Raise the stakes with this amazingly fun inertia activity. This creative activity uses sheets of paper or index cards to separate a tower of cups or blocks, which your students then need to pull out quickly without disturbing the tower. Can they remove all the pieces of paper?

Learn More: Perkin’s E-Learning

11. Rice Friction Experiment

Friction can be a challenging concept to teach middle school students. Thankfully this experiment makes it a little bit easier! Give your kids a better understanding of this tricky concept by using a plastic bottle, funnel, chopstick, and rice. They’ll learn how to increase and decrease friction and will be amazed when this amazing force lets them lift a bottle up with just a single chopstick!

Learn More: Carrots Are Orange

12. Balancing Robot

Combine arts and crafts and physics with this adorable activity! Use the printable template and have your kids customize their robots, decorating them however they like before cutting them out. Next, you’ll use some putty to stick a penny to the end of each of the robot’s arms. All that’s left is to let them find out where they can get their robots balancing! 

Learn More: Buggy and Buddy

13. Make Your Own Ice Cream in a Bag

You had us at ice cream! Your kiddies will be so excited to have a go at making their own ice cream using just a few Ziplock bags. Have them start by measuring cream, sugar, and vanilla flavoring into one bag, making sure it’s sealed up. Then, get them to place this bag inside another bag that also has ice and salt inside and shake! Once they’re done learning, make sure you set aside time for some taste testing!

Learn More: Delish

14. Skittles Density Rainbow

Build the rainbow with this fun density experiment. Start by having your kiddies dissolve Skittles in water, using a different quantity of each color of Skittles in each liquid. They’ll then gently use a pipette to layer their liquids while you discuss how the solids have impacted the density of each liquid!

Learn More: Gift Of Curiosity

15. Dancing Raisins Science Experiment

Did you know that you can make raisins dance? Ok, well maybe they’re not actually dancing, but they’re definitely doing something! Your learners will love this fun science experiment where they’ll watch as they watch the carbonation and bubbles of the soda water lift the raisins and “make them dance”.

16. Learning With Dry Ice

Dry ice is so exciting for your little learners! It has almost magical properties that give it a mysterious element that kids are completely captivated by. Using dry ice is a great way to teach students about how clouds are formed and how they eventually evaporate by capturing a dry ice cloud in a bag! You’ll be inspiring future meteorologists with this visually appealing experiment!

Learn More: Penguin Dry Ice

17. Learning About Arches

Arches are surprisingly impressive feats of architecture. Their unique shape actually makes them surprisingly strong! Teach your kiddos about how heavy-weight objects such as cars on a bridge are supported as they test out different types of arches to see which one holds the most weight!

Learn More: Imagine Childhood

18. Heat Changing Colored Slime

This unique experiment requires very specific materials, but we promise it’s worth it! Blow your kids’ minds as they learn about thermodynamics and how heat can change the color of certain materials as they make some heat-sensitive color-changing slime! 

Learn More: Left Brain Craft Brain

19. Homemade Marble Run

Let your kiddies get creative with any materials they can get their hands on with this next activity! Challenge them to create a track for marbles, testing out different course layouts to see how these impact the time it takes the marble to complete it. Encourage them to record their results and share their findings!

Learn More: Buggy And Buddy

20. Ice Hockey Puck Friction Experiment

The ice hockey fans in your class will love this next one! In this activity, your kids will use different flat circular items like bottle caps and coins to determine which materials make the best ice hockey puck! This is a great experiment to take outside on an icy winter day to let them learn about and see friction in action!

Learn More: Science Sparks

21. Transfer of Momentum Basketball Activity

Here’s a quick physics experiment your kiddos can do during recess or on a sunny day! Grab some basketballs and racquetballs and instruct your kids to hold the smaller ball on top of the basketball. Next, have them let go and watch in amazement as the basketball bounces up into the racquetball, transferring momentum as it makes contact! 

Learn more: Frugal Fun 4 Boys

22. Pumpkin Boats

Wondering what to do with all those leftover pumpkins after Halloween? Look no further! Get your learners to make them into boats as they investigate the link between density and buoyancy. Support them to make differently-sized pumpkin boats and then make predictions about whether or not their pumpkin boat will sink or float.

Learn More: The Preschool Toolbox

23. How to Make a Hovercraft

Hovercrafts were once something that only appeared in sci-fi stories, but now your kids will be making them in your classroom! Using simple household materials, they’ll learn how to harness the power of air resistance in this unique craft. Neat!

24. St. Patrick’s Day Balloon Rockets

This holiday-themed activity is a great way to teach students about air resistance and acceleration! Your kids will craft their balloon rockets with a balloon, some tape, and a straw to keep it attached to the line. All that’s left is to let go to watch their balloon rockets blast off down the track! Why not make it competitive with a prize for the winning balloon of each race?

Learn More: Housing A Forest

25. Marshmallow Shooter

Your learners will love this silly activity that incorporates a favorite sweet treat and a unique contraption! As they launch their marshmallows through the air, you can discuss how the force of the pull impacts the motion of the marshmallows.

Learn More: Teky Teach

26. Use The Force

Star Wars fans will have fun with this one as they use “the force” to magically pick up paper clips! This exciting activity will have your kiddos wanting to learn more about magnetism and how it works! Simply have them place a large magnet on the back of their hand, reach toward a pile of paper clips, and watch as the paper clips magically fly into their hands!

Learn More: Rookie Parenting

27. Magic Toothpick Star Experiment

You’ll have a tough time convincing your kids that this experiment shows physics at work and not magic! Have your kids take five toothpicks and snap them in half. Let them arrange them as shown, and then drip water in the middle of the sticks. They’ll be amazed as the water moves the sticks, seemingly mending them and creating a star!

Learn More: Living Life And Learning

28. Water Powered Bottle Rocket

Bottle rockets are a fun science experiment to bring the science classroom outdoors . Your students will love learning about pressure and how it impacts the velocity of an item using just a recycled plastic bottle, a cork, some water, and a pump with a needle adaptor. To add even more excitement to this activity, let your kiddos decorate their own rockets!

29. Magnetic Levitation Activity

With all these seemingly magical experiments, your kids are really going to wonder if you attended Hogwarts instead of a teacher-training college! Use the power of magnets to make a pencil float! Show your kids how to position their magnets so that they repel each other enough to suspend a pencil in mid-air! 

Learn More: Arvin D. Gupta Toys

30. Rubber Band Powered Car

This adorable craft will teach your kiddos about force and motion! Let them spend some time going through a trial and error process to make a working car that’s powered by applying force to a  rubber band! Once they’ve got their models working, let them race to see whose creation goes the fastest and the farthest!

Learn More: Stem Inventions

31. Making a Water Wheel

Waterwheels have been around since Roman times, over 2000 years ago! Historically they were used in mills to grind grains into flour but nowadays they can be used as a source of renewable energy. Task your pupils with making a working waterwheel out of some simple household items like plastic cups, straws, and tape- are they up to the challenge? 

Learn More: Deceptively Educational

32. DIY Pulley Physics

This pulley system will show your students that simple machines aren’t always so simple! Using whatever materials they can find and some string, they’ll need to create a fully functional, intricate pulley system along your classroom walls! This would make a great display for the entire school year!

Learn More: The Homeschool Scientist

33. How to Make an Orange Sink or Swim

What is more likely to float, a peeled or unpeeled orange? Let your kids vote on this seemingly straightforward question then reveal the answer with a simple demonstration. Your students will watch in awe as they learn that they can change the density and buoyancy of an object by slightly altering it. In the case of the orange, however, the results might not be what they were expecting!

Learn More: Woo Jr.

34. Paper Airplane Test

There’s nothing kids love more than making and throwing paper airplanes. If they’re usually banned in your classroom, then you might want to consider lifting that ban for one day! Turn this simple activity into an engineering investigation where your students will test out different designs to see which shape of the paper airplane will fly the furthest and which shape will stay in the air the longest! Physics made fun!

Learn More: Feels Like Home

35. Rising Water Experiment

Water experiments in the classroom can be so much fun! This activity will teach your students how temperature and oxygen levels can affect the density of the air! All you’ll need are some matches, a cork, a plate of water, and a glass! They’ll love watching what seems like magic!

Learn More: Teach Beside Me

36. Physics Mystery Bag Challenge

This unique physics activity will have your kiddos work in groups to solve a physics mystery. Each group will receive identical bags of mystery items and will be told what type of machine they need to create. The challenge is that there are no instructions! Using only the items in front of them and their ingenuity, your students will compete to see which group creates the best of the designated machine!

Learn More: Teaching Highschool Math

37. Solar Oven S’mores

Fun science experiments are even better when combined with food! This solar oven teaches your students about how transmission, absorption, and reflection are used in a solar cooker to cook food. Your middle schoolers will be amazed at how easy it is to make yummy smores using an array of simple supplies, such as plastic boxes, aluminum foil, cotton, and glass.

Learn More: PBS

38. Laser Jello

Here’s another edible science project for your class! In this fun project, your kiddos will put the concepts of reflection and refraction into practice in a hands-on experiment. Give them some red and blue Jello to investigate how differently colored lasers project through it; they’ll be amazed as the Jello changes the lasers’ color and sometimes blocks out the light altogether! 

Learn More: Exploratorium

39. The Electric Butterfly

Elevate the basic static-electricity balloon experiment by adding a paper butterfly! Teach your learners about positive and negative electrons by charging up the balloon with static electricity and using it to move the paper butterfly’s wings. This hands-on activity is a super way for them to see what can be a very abstract concept in action!

Learn More: CACC Kids

40. Homemade Thermometer

This classic science experiment is great for showing how heat affects certain liquids by making them expand. Using the simple supplies of a bottle, cold water, rubbing alcohol, food coloring, a straw, and some modeling clay, have your students build their very own thermometer. As they heat or cool the surroundings, your kiddos will observe the liquid rising and falling in the straw!

41. DIY Electromagnet

Creating an electromagnet is a cool way of combining middle-grade physics and engineering! This fun activity uses screws, some wire, and batteries to demonstrate how an electric current flows through metal to create a magnetic field. After this simple experiment, you can challenge your kids to take this activity to the next level and create bigger versions like their own electromagnetic cranes!

Learn More: Teach Engineering

42. Optical Illusion Fun

Experiments don’t get much cooler than optical illusions! You can use these amazing visual activities to teach your middle graders about how our eyes process light and send signals to our brains. Simply print out the template and let your kids add some color before they cut them out and attach them to a pencil. As they spin, they won’t believe their eyes! What a fun way to make this lesson about our eyes memorable!

43. Water Cycle in a Bag

This cute little experiment is a great way to give your kids their very own visual of the water cycle! Print off the template and let your kids trace it onto their own Ziploc bag. All that’s left is to add water and tape it to a window where it’ll catch the sun! These little experiments are really quick to make and set up, but your kids will spend days analyzing them!

Learn More: Kiwi Co

44. Homemade Barometer

Your students might have already made a DIY thermometer, but what about a barometer? You can help them learn about atmospheric pressure by crafting barometers using a jar or can, a balloon, a wooden stick, rubber bands, and some tape! As the weather changes over the next few days, so will the air pressure which will move the wooden stick of their barometers! Cool, right?!

Learn More: Easy Science For Kids

45. Basic Motor Mechanics

It is amazing what you can do with some modeling clay, a magnet, a battery, and wire! This cool project showcases how electric energy works, demonstrating the interaction between the current and a magnetic field. This nifty little experiment will definitely get your students’ physics motors running! 

Learn More: Education

46. Xylophone fun

Sound waves are much easier to teach and learn about when your kiddies can make visual connections. Have your learners fill empty jars with varying amounts of cold water (and a few drops of food coloring in each to make it look even more interesting) and then let them test the different pitches by hitting each one! 

Learn More: Sugar, Spice And Glitter

47. Build a Paper Bridge

This fantastic activity uses some really simple materials to challenge your kiddies to ‘build a bridge’. What seems like a pretty basic activity actually teaches them all about the scientific method and physics concepts behind building a bridge. They’ll learn about concepts like compression and tension to explain how bridges stay in place even under pressure! This is one your future engineers will love! 

48. Magnet Maze

Art and physics are combined in this clever classroom experiment! Task your students first of all, with drawing a colorful maze on the outside of the bottle. Next, have them put in different items like coins, marbles, paperclips, and buttons to explore which ones they can attach the magnet to from the outside and navigate through their maze. A -maze- ing, right?!

Learn More: Science Museum Group

49. Super Sundial

If you feel like taking your teaching outdoors, this sundial construction lesson is ideal! Bring some paper plates, bendy straws, and a pencil, and you’re good to go! Your learners won’t need a lot of background knowledge before the activity, but they’re sure to learn a lot about the Earth’s orbit and rotation in the process!

Learn More: Generation Genius

50. Sound Sandwich

Your kiddies might initially be confused when you announce that they’ll be making sound sandwiches! Their confusion will soon turn to fascination at how such simple materials can make really interesting sounds! In this activity, they’ll be learning how to make music with sticks, straws, and rubber bands. See if they can figure out that it is the rubber band vibrating that makes the differently-pitched sounds!

51. Optical Lens Experiment

Did you know that you can actually bend light? Your students will be surprised to learn this for sure! Through this investigation, you’ll teach them how when light goes from one medium to another (e.g. from air to glass), it usually bends. This series of simple activities covers the effects of convex and concave lenses on light, and thus how refraction works.

Learn More: Discover Primary Science And Maths

52. Density Tower floating experiment

Combine the previously mentioned density tower and floating experiments in this cool activity! Using just a few simple ingredients that can be found around most homes, you can instruct your learners to combine cornstarch, vegetable oil, and rubbing alcohol. This will create the colored layers in this cool activity! Then they’ll add small items of their choosing to see which ones float in the various liquids, and at what density!

53. Walking Water experiment

Capillary action isn’t a term that most of your kiddies will be familiar with but after doing this experiment they won’t forget it! Help your learners set up a row of cups with water and different colors of food dye. Next, they’ll add some strips of paper towels dipping each end into a different up and let them watch in amazement as the colored water seems to defy gravity and ‘walk’ up the paper and into the next cup!

Learn More: Made In A Pinch

54.  Build a Solar Still

This easy experiment is the perfect way to demonstrate the water cycle and how sunlight can purify water. Start by letting your kiddos have a bit of fun to make ‘dirty’ water using assorted safe and edible kitchen ingredients. Then you’ll challenge them to make their own solar stills from plastic glasses, cling wrap, and, a bowl. Finally, they’ll set their glass of ‘dirty’ water inside the bowl, cover it with cling wrap, and then sit it out in the sun. And voila – clean water!

55. Slinky Sound Waves

A metal slinky is a super simple but really effective source of demonstrating sound waves for your kids. Get two volunteers to hold the ends of the slinky and encourage your other students to take note of the different wave patterns when one or both of them shake it. This is a super way to make this abstract concept a little more visual for your class.

Learn More: Fizzics Education

56. Bike Wheel Gyroscope 

Momentum is an important concept that your little physicists will cover in middle school science. A bike wheel gyroscope activity will amaze and enthrall your students as you use it to show off how the wheel’s mass and rotation obey the laws of angular momentum! The best part is that you’ll only need a bike wheel and some willing participants! 

Learn More: NASA

57. DIY Kaleidoscope

Teach your kids all about the law of multiple reflections with this super fun, customizable activity! Using a cardboard tube, some mirrors, and small colorful items like confetti or sequins, these kaleidoscopes will be something they’ll always remember making. If you don’t have mirrors, why not try using aluminum foil instead? 

Learn More: Home Science Tools

58. Mapping Magnetic Field Lines

Teaching theoretical, intangible ideas is one of the hardest parts of teaching a subject like physics. Thankfully this short but practical activity makes this a whole lot easier by showcasing how the magnetic field lines of a bar magnet do not ever cross, are continuous, and go from north to south! All your kiddies will need is a magnet, a compass, and a marker!

59. Buzz Wire game

Electrical circuits can be really interesting to make, and this activity makes it fun too! Get your students to create their own ‘Buzz Wire’ game which will teach them about the loop system needed for electricity to work. Once they’ve made their loops, let them have a go at completing each others’ games! Can they get to the end without setting the buzzer off?

60. Galileo’s Gravity Experiment

As the story goes, Galileo dropped two items from the Leaning Tower of Pisa to see which hit the ground first. Though we can’t be sure he actually did this, you can be sure that your students will have fun trying out this similar activity to learn about the effects of mass and air resistance on falling objects! Simply have them pick out two different objects, drop them from a height, and record which lands first!

Learn More: Science-Sparks

Science Fun

Force And Motion Science Experiments

Easy motion science experiments you can do at home! Click on the experiment image or the view experiment link below for each experiment on this page to see the materials needed and procedure. Have fun trying these experiments at home or use them for SCIENCE FAIR PROJECT IDEAS.

Strength Test:

Magic Ball:

Observe Centrifugal Force In Action

Can A Light Weight Lift A Heavy Weight?:

Coin In A Cup:

Observing Inertia:

Coin Flick:

Magically Remove The Bottom Coin

Hammer Head:

Seemingly Defy Gravity

Galileo’s Swinging Strings:

Use Straws To Reduce Friction:

Find A Hard Boiled Egg:

Use Spinning Science In This Experiment

Unbreakable Thread:

Magic Napkin:

Cotton Ball Catapult:

Rapid Rubber Band Launcher:

Send A Bunch Of Rubber Bands Flying

Water Balloon Physics:

Centrifugal Force: 

Stab A Potato:

Traveling Toothpicks:

Surface Tension And Toothpicks Do Mix

Balance A House On Your Finger:

Ruler Race:

Easy Film Canister Rocket:

Rocket Balloon Blast:

This Balloon Really Moves

Mini Marshmallow Launcher:

Build Your Own Balance Buddy:

Click on an Physics Experiment below for easy steps to set up an experiment This experiment is perfect for teaching kids about the science of physics.

• Physics Experiments

How to Make a Balloon Rocket

Balloon Rocket Experiment

Soil Erosion Experiment

How to Make a Compass

How to Measure Magnetic Field

How to Make a Paper Glider

Buoyancy Force Experiment

Buoyancy Experiment

Water Siphon Experiment

Center of Gravity Experiment

Physics Center of Gravity Experiment

Light Sensor Experiment

Physics: Light Sensor

Can Crushing Experiment

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6 Simple Physics Science Experiments for Kids

Physics is the natural science that deals with matter, energy, motion, and force. The goal of studying physics is to understand how our world, and by extension, how our universe works! Here are 6 super simple science experiments for kids to explore density, gravity, electricity, and pressure. You probably already have the materials you’ll need laying around the house: eggs, water, food coloring, oranges, a comb and even spaghetti!

Changing the Density of Water

Have you ever seen a lake freeze in winter? When the temperature drops, a sheet of ice forms across the top, but underneath the ice layer, the lake is still there. Why does this happen, and why do you think it’s so important? We’ll tackle these questions in the following experiment. We’ll take a close look at the effects of temperature on water, and see what happens when you try to mix differently tempered water.

Changing the Density of Water Printable Instructions

What you’ll need:

• Two containers such as jars or measuring cups
• Food coloring

1. Add approximately four cups of water to a container. Add 2-3 drops of blue food coloring and mix well. Chill in the refrigerator overnight.

2. Heat approximately 1 cup of water to steaming or just boiling. Add 2-3 drops of yellow food coloring and mix well.

3. Slowly pour ~1/4 cup cold water into the hot water. Make sure to pour very slowly and along the side of the container so there is minimal mixing. You should see two layers form. Time how long it takes for the two layers to gradually come together to make a single green layer.

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-------------------------------------------------------, what’s happening.

Changing the temperature of water affects its density. When water heats up, its molecules vibrate and move around. This makes the space between them increase, resulting in a lower density. As the water cools down, its molecules slow down and come closer together. This makes the water more dense. The cooled water in our experiment sank to the bottom because it had a higher density than the heated water. It turned green because it touched some of the hot water on the way down, cooling it down and making it sink.

In nature, this phenomenon is responsible for a process called “turnover.” The sinking of cooler water and rising of warmer water causes the layers of a lake to mix, allowing nutrients such as oxygen to be dispersed throughout. So why doesn’t a lake freeze solid from the bottom up? The density of water continues to rise until it reaches freezing, but then its density changes again. Ice is far less dense than liquid water, so any water that freezes rises to the top. The ice forms a layer across the surface of the lake, but the lake remains liquid underneath, allowing the plant and animal life to survive through the winter.

How to Make an Orange Sink or Swim

When trying to guess if an object will float, it’s useful to take into account the object’s density. Density is defined as mass per unit of volume, and objects with a higher mass-to-volume ratio have a higher density. Objects that are denser than water will sink, while those that are less dense will stay afloat.

Because it’s less dense than water, an unpeeled orange will float. It should stand to reason that peeling an orange, and thereby decreasing its mass, should have little or no effect. What happens, in fact, is the opposite. It may seem counterintuitive, but in the following experiment we’ll see that peeling an orange actually makes it sink.

How to Make an Orange Sink or Swim Printable Instructions

• A wide-mouth container such as a jar

1. Fill the jar with enough water to cover an orange, should it be submerged.

2. Gently place an unpeeled orange into the water. Observe what happens. Does the orange sink or float?

3. Remove the orange from the jar and peel it.

4. Place the peeled orange back into the jar. What happens to the orange now?

It may seem like peeling the orange should allow it to float even better, since by peeling it we’re removing some of its mass and making it lighter. In fact, what we observe it that peeling an orange makes it sink. This seems illogical until you consider the nature of density.

Density is defined as mass per volume. An orange peel is highly porous, meaning that it has lots of tiny holes in it. The holes are essentially tiny bubbles of air. These air pockets are empty space, or pockets of no mass that, when calculating the total density, serve to decrease the final result. When you take away the peel, the air pockets are removed. Now, the orange has a higher density, because its mass per unit of volume is goes up. The orange is now denser than water. It therefore sinks. So, while it seems to go against reason, the result is actually adhering to the rules of density.

How to Use Gravity to Tell if an Egg is Cooked

“Gravity” is the force that draws us toward the earth, and it’s responsible for making things fall to the ground when they’re thrown up, or dropped from a distance. The “center of gravity”, or the “center of mass”, is the point at which an object’s weight is concentrated. It can be considered as the point on which gravity acts on an object.

Having a stable center of gravity makes things like spinning tops possible, or for a tightrope walker to balance on a thin wire. We can also take advantage of this phenomenon to determine if an egg is cooked, without having to crack the egg open!

How to Use Gravity to Tell if an Egg is Cooked Printable Instructions

• 1 small pot
• Water for boiling

1. Hard-boil one of the eggs. *Note: this part requires adult supervision. There are several ways to hard-boil an egg, but for the purposes of this experiment we want to make sure the egg is thoroughly hard-boiled. To achieve this, let the egg sit in actively boiling water for at least 15 minutes.

2. Drain the egg and rinse it under cool water. Place the egg in the refrigerator for an hour or more. This is it so you can’t tell which egg is cooked simply by checking the temperature.

3. Remove the cooked egg and the raw egg from the refrigerator. Spin the eggs, one at a time, on a countertop or clean surface. Note the differences in the way each egg moves. One egg spins smoothly while the other wobbles about and is difficult to spin.

The contents inside the raw egg’s shell are liquid, so they’re able to move around.  When you try to spin the raw egg, its contents shift around. This makes it so the egg’s center of gravity is constantly changing. Because it doesn’t have a stable center of gravity, the egg doesn’t spin smoothly, as a top would, but wobbles about. The cooked egg, on the other hand, is solid inside. Its center of gravity remains the same. Therefore, the hard-boiled egg will spin smoothly, and is easily distinguished from the raw egg without cracking either egg open.

Testing a Spaghetti Bridge

One of the key decisions in construction is the selection of building materials. Depending on their composition, different materials are capable of withstanding different loads. We can examine this concept by constructing a miniature bridge, and then testing its ability to support weight. We’ll use strands of uncooked spaghetti to look at how the structural makeup of a particular building material affects its ability to withstand pressure.

Testing a Spaghetti Bridge Printable Instructions

• Paper clip or S hook
• Small paper cup
• Several coins

1. Place one strand of uncooked spaghetti between two jars or boxes so that the spaghetti forms a bridge.

2. Bend the paper clip to form an S hook (or simply use and S hook) and poke a hole in the paper cup. Suspend the paper cup from your hook, and then carefully hang the hook and cup on the spaghetti bridge.

3. Add coins to the cup one at a time. Record how many coins you can add before the spaghetti breaks.

4. Set up the experiment again, but this time use two strands of spaghetti to construct the bridge. How many coins can your new bridge hold before it breaks now?

5. Repeat the experiment using increasing amounts of spaghetti strands. What do you notice about the ability of the bridge to carry coins as you add more strands of spaghetti?

A strand of uncooked spaghetti is very brittle, and will snap when pressure is applied to it. When we add additional strands of spaghetti, however, the pressure is distributed among the strands, so the total pressure applied to each is lower. The strands are basically sharing the load, so the number of coins that can be added before the bridge breaks increases.

An example of a building material that utilizes this principle is plywood. Plywood is made up of multiple thin sheets of wood veneer that have been glued together. This results in a material that’s capable of withstanding a higher amount of pressure than would be possible by just one single sheet.

How to Make a Comb “Magnet”

Chances are, you’ve experienced static electricity at some point. That tiny shock you feel sometimes when you reach for a doorknob, the way your hair stands up when you brush it, the way your hat clings to your hair – all of these are examples of static electricity.

In the following experiment, we’ll use static electricity to make a “magnet.” We’ll generate an electric charge on a hair comb and examine how that charge works. By the end of the experiment, we’ll have a better understanding of static electricity, why it behaves the way it does, and what we can do to minimize its effects in our daily life.

How to Make a Comb “Magnet” Printable Instructions

• A hair comb

1. If your tissue is 2-ply, separate the two layers and use only one. Using scissors, cut the tissue into quarters. Set one of the quarters flat on a tabletop.

2. Run a comb through your hair several times (at least 12 times) in quick succession. This works best on clean, dry hair, and will yield the best results with the finer part of the comb, or the end where the teeth are closer together.

3. Immediately after running the comb through your hair, touch the comb to one edge of the tissue. You’ll know it worked if the tissue rises up to meet the comb as soon as it comes close. Using your new “magnetic” comb, lift the tissue from the table and up into the air.

Static electricity is generated when negatively charged particles called “electrons” are transferred to an object and allowed to accumulate. In the case of our experiment, the object was the comb. Electrons “jumped” from our hair onto the comb, giving the comb a temporary negative charge. Because opposites attract, the negative charges on the comb were drawn to the positive charges on the tissue, and the tissue “stuck” to the comb.

Drier conditions are more conducive to static electrical buildup, which is why you tend to get more static shocks in the winter. This is because water is a great conductor. When there’s moisture, the static electrical charges that naturally build up on a surface can be absorbed by water particles suspended in the air. These water particles aren’t present during dry conditions, so the charges accumulate, only to dissipate all at once when they come into contact with another object, such as your hand on a doorknob.

Make an Egg Float in Water

Not everything floats in water. An egg, for instance, will sink to the bottom when placed in a container full of water. A ping-pong ball, on the other hand, will float. Why does this happen? What makes something float or sink? The answer is density. Objects that are denser than water will sink. Those that are less dense will float.

The following experiment will allow you to observe the effect of density in action. By changing the density of water, we can change an egg’s ability to float.

Make an Egg Float in Water Printable Instructions

• A see-through container such as a jar
• An Egg (Note: The egg doesn’t have to be hard-boiled, but it might be less nerve wracking to let little ones handle a hard-boiled egg.)

1. Add 1 cup of water to the empty container, or however much it takes to fill the container halfway and allow an egg to be completely submerged. Gently place the egg in the water and observe what happens.

2. Remove the egg. Add 6 tablespoons of salt to the water in the container and stir to mix. Gently place the egg back in the salt water and observe.

3. Remove the egg and rinse it with fresh water. Slowly, so as not to disturb the salt water, add one cup of clean water into the container. The goal is to layer the fresh water onto the salt water, not to mix the two layers. Place the egg in the container a third time.

An egg has a higher density than water, so it won’t float. When we added salt to the water, however, we changed its density. We made it so the water had a higher density than the egg. Because of this, the egg was able to float. To further highlight this concept, we added a layer of fresh water over the salt water. The egg sank through the fresh water but stopped sinking when it reached the saltwater layer.

One point to emphasize is that an object doesn’t have to weigh less than water in order to float, it just has to be less dense. This means that it has to have a greater number of pockets of empty space in relation to its mass. This is how boats are able to float despite being so large and heavy, and it’s why a ping-pong ball will float, but an egg will not.

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50+ Physics Project Ideas

Physics is a branch of science that mainly deals with the study of the phenomena naturally existing in the universe. To get a better understanding of the laws of nature, physicists keep themselves regularly engaged in various experiments. Interestingly, there are certain experiments and activities that one can perform easily at home to verify the existence and righteousness of various laws of the universe. Some of the basic physics project ideas are given below:

1. Balloon Car

A balloon car is one of the simplest physics project that one can make at home with the help of easily available objects. The main items required to make a balloon car include one plastic bottle, two straws, four bottle caps, one balloon, and glue. First of all, place the bottle horizontally on the table and make two pairs of grooves on the curved surface of the bottle near the opening and the base. Cut a straw in half, insert both the straw pieces into the pair of grooves. Attach four bottle caps to the ends of the straws with the help of glue. Make a grooving on the top of the plastic bottle and fix a straw in the hole in such a way that a portion of straw is present on the top, while the rest part of the straw lies inside the bottle. Attach an inflated balloon to the end of the straw that is present on the top of the bottle. When the air escaping the balloon creates air pressure on the surface, the structure tends to move forward. From this particular project, one can easily learn about air pressure, state of the matter, rotatory motion, linear motion, conversion of motion from one form to another, and various other physical parameters.

Balloon Car

2. Catapult

A catapult is yet another simple project that one can easily make at home. To make a catapult, you need ice cream sticks, rubber bands, a bottle cap, and glue. First of all, build a stack of five ice cream sticks. Tie a rubber band on each end of the stack. Make sure that the rubber bands are properly tied and the sticks do not move. Now, take two more ice cream sticks. Place one of them on the top of the other to form a stack and attach a rubber band on one side of the stack. Slide the stack of five ice cream sticks between the stack of two ice-cream sticks. Wrap rubber band on the intersection point of the stacks to hold the catapult in place. Fix a bottle cap on the top stick with the help of glue. The catapult is ready. Place the projectile in the bottle cap, slightly push the topmost stick downwards, aim for the target, and release. It provides the user with the opportunity to learn about elasticity, tension, action-reaction force, projectile motion, and various other phenomena existing in nature.

3. Homemade Rocket

To make a homemade rocket physics project, you need an empty plastic bottle, vinegar, baking soda, three pencils, tape, a pair of scissors, and a cork. To make the structure of the rocket, attach the three pencils to the curved portion of the bottle near the top part. Make sure the pencils are placed at equal distances from each other in such a way that when the bottle is placed upside down on the ground, the mouth of the bottle does not touch the floor. The pencils should provide a rigid and stable launching pad for the model rocket. Pour some vinegar into the empty plastic bottle then add baking soda powder to it with the help of a funnel. Quickly use the cork to seal the bottle tight. Place the model rocket on the ground, move away, and observe the launch. This project helps the user understand the basic kinematics of a rocket, the chemical reaction of baking soda and vinegar, and the projectile motion of objects.

Homemade Rocket

4. Baking Soda Volcano

Displaying the volcanic eruption with the help of baking soda is a popular science experiment that involves a simple set of steps. To make a baking soda volcano at home, you require dish soap, water, food colouring, white vinegar, baking soda, and a plastic bottle. First of all, make the baking soda slurry by properly mixing a portion of baking soda with an equal part of water. Now, add water, vinegar, dish soap, and a few drops of food colouring into the plastic bottle. Pour the baking soda slurry into the bottle containing the mixture. Move a few steps back and observe the volcanic eruption from a distance. The chemical eruption occurs due to a chemical reaction between the vinegar and baking soda that produces carbon dioxide gas. Carbon dioxide gas tends to spread in the surroundings because it is comparatively heavy than the other gases present in the atmosphere; however, due to the confined area of the plastic bottle, it tends to cause an eruption.

Baking Soda Volcano

5. Fountain

To make a fountain as a physics project, you require plastic containers, wooden blocks, vinyl tubing, water pump, power supply, drill machine, pebbles, stones, miniature plants, cutter, and glue. Form the base of the fountain as per your choice with the help of wooden blocks. Drill a hole at the base of one of the plastic containers and another hole on the side of the other plastic container. Pass the vinyl tubing through both holes. Glue the tube around the joints and holes. Place the containers into the wooden structure of the fountain in such a way that one of the containers is present at a height more as compared to the other container. Make a hole on the front side of the container present above the base container. Attach a small water pump at the end of the tube and connect it to the power supply. Decorate the structure with the help of pebbles, stones, paint, miniature plants, etc. Pour water into the containers and observe the water flowing just like a fountain in a miniature pond. This project would help the users understand the flow of fluids, the working of a water pump, potential energy, and kinetic energy.

6. Newton’s Cradle

Newton’s cradle is one of the most interesting structures that demonstrate the law of conservation of energy and momentum in the easiest way. To make Newton’s cradle at home for your physics project, you need ice cream sticks, a glue stick or glue gun, marbles, string, a pair of scissors, tape, and a pencil. Glue eight ice cream sticks end to end and form two separate square-shaped structures. Attach these two squares to each other with the help of four ice cream sticks in such a way that the resultant structure is shaped like a cube. Cut the string into eight equal-length pieces. Keep the length of each string approximately equal to 8 inches. Attach marbles to the centre of each piece of the string with the help of glue or a hot glue gun. Mark 6 equally spaced points on the top two parallel ice cream sticks of the cube. Place the ends of the strings on the marks and apply tape on them. Allow the marbles to hang in between. Newton cradle physics project is ready to demonstrate momentum and prove the existence of the law of conservation of energy in real life.

Newton’s Cradle

7. Balancing Scale 

A balancing scale is a prominent physics project that is capable of demonstrating weight, gravity, equilibrium, and various other concepts. To make a traditional weighing scale at home, one would need two identical paper plates, string, pencil, tape, glue, a pair of scissors, and a cloth hanger. Punch three holes in both the paper plates. Make sure the holes are close to the outer boundary of the plates. Cut out six pieces of string that are equal in length. The length of each string should be approximately equal to 2 ft. Attach one end of each string to the individual holes punched in the plates. Hold one of the paper plates and take the three strings attached to the holes grooved into it. Properly stretch the strings and tie them together in a single knot. Perform the same procedure with the other plate. Carefully, hang the paper plates on each side of a cloth hanger. Hold the cloth hanger from the hook and begin weighing the objects.

Balancing scale

8. Periscope

A periscope is a device that is used by submarine operators to see the objects above the water surface. To construct a periscope at home, you require two congruent pieces of mirror, cardboard or a PVC pipe, cutter, tape or glue. Use cardboard to make three hollow cuboids and arrange them in the shape of a real periscope. Attach the mirror glasses to the opposite corners of the structure at an angle equal to 45°. Hold one end of the periscope on eye level and look at the distant objects easily. This would help the user understand the working of mirrors and the laws of reflection.

9. Visual Doppler 

To construct a model that displays the doppler effect in real life, you require two craft papers, a ruler, a pair of scissors, tape or glue, a small toy car, blank paper and pencil or a camera. Firstly, cut out a few five-inch wide strips from the craft paper. The length of the strips should be maintained in such a way that each strip is one inch shorter than the previous one. Tape or glue the ends of the strips together to form loops. Put a toy car in the middle of the second craft paper and arrange the loops around the car in a manner that the loops do not touch each other or the car. Make sure the distance between the loops is the same. Here, the loops represent the sound waves. Take a picture of the arrangement of loops around the car when it is standing still. In case you do not have a camera, draw the impression of the arrangement of loops around the car on blank paper with the help of a pencil. Roll the toy car gently in the forward direction until it touches the loops and pushes them together. The loops present in the front get squished together and demonstrate the high pitch sound, whereas the loops at the back get spread out and tend to display the low pitch sound. Record the position of the loops after the movement of the car with the help of a camera or by drawing an impression of the scene on a blank sheet. This experiment and physical model effectively demonstrates the concept of the Doppler effect, compression, rarefaction, and the nature of sound waves.

Visual Doppler

10. Electric Motor 

An electric motor is yet another simple physics project that one can easily build at home. To make a fully functional electric motor, you require a battery, a small piece of magnet, electric wire, two paper clips, electric tape, and a knife. First of all, wrap the electrical wire around a cylindrical object such as a battery about ten to twelve times to form a loop. Now, grab the ends of the wire and tie them across the loop of the wire. Remove the insulation from the ends of the wire. Take two paper clips and stretch one end of each clip. Attach the flat end of the clips to the positive and negative terminals of the battery with the help of electrical tape. Place the loop of wire between the curved ends of the paper clips. The final step is to place the magnet under the loop of the electrical wire. Tape the magnet on the battery to hold it in position. With the help of this particular project, the user would be able to have a better understanding of magnetism, conduction of current, rotatory motion, transfer and transformation of energy, etc.

Electric Motor

11. Compass 

Building a compass at home is a prominent idea for a physics project. The materials required to build a simple compass include a sewing needle, knife, cork, magnets, and a bowl filled with water. Firstly, hold the needle and magnetise it. The magnetisation of the needle can be performed easily by stroking it with the help of a piece of magnet 30-40 times along the length. Now, flip the magnet upside down and use it to stroke the needle in a similar manner, but make sure that the magnet is moved linearly in opposite direction. Cut 1-2 cm thick portion of the cork with the help of a knife. Carefully insert the needle in the middle of the cork. The compass is ready to be tested. When the compass is placed in a bowl filled with water, it tends to point towards the North. The physics concepts that one can visualize and understand with the help of this particular project include magnetism, the magnetic field of the earth, magnetic induction, shear force, etc.

12. Marble Roller Coaster 

To make a marble roller coaster, you require a cardboard sheet, chart paper, glue or tape, and marbles. Make a roller coaster pattern full of curves and turns with the help of chart paper. Use the cardboard pieces to elevate the height accordingly. Decorate the set-up as per requirement. Make sure the elevation of the initial or start-up point is higher than the rest of the structure. Place the marble on the start point and roll it down the structure. This project would help the student or the user understand the conversion of potential energy to kinetic energy, curvilinear motion, rectilinear motion, rolling friction, etc.

Marble Roller Coaster

13. Air Blaster

To make an air blaster, one would require a plastic bottle, a knife or cutter, a balloon, and tape or glue. Carefully cut the base of the bottle with the help of a knife or cutter. Now, cut the top portion of the balloon. Stretch the base portion of the balloon and fix it on the base of the bottle with the help of tape. Make sure there is no leakage of air from the sides. Hold the balloon attached to the bottle from the centre, pull it backwards, and release. An air vortex gets formed. Here, the user would be able to understand the working of an air vortex, the elasticity of materials, air pressure, and various other physics-related concepts.

Air Blaster

14. Potato Battery

To make a potato battery, you require a potato, a voltmeter, a galvanized nail, a piece of copper sheet or a copper coin, and two alligator connectors with clips on each end. A potato battery is capable of generating enough energy required to power a clock. Firstly, insert the galvanized nail into the potato. Make sure the potato is large enough and the nail does not go through it completely. An inch away from the nail, stick a copper coin or a piece of a copper sheet into the potato. Connect a voltmeter to the set-up and measure the voltage generated. Attach the black wire of the voltmeter to the galvanized nail and the red or yellow wire of the voltmeter to the coin. With the help of this simple physics project, the user can learn the basics of electricity, the concept of voltage, conversion of energy, etc.

Potato Battery

15. Balloon Hovercraft

To construct a balloon Hovercraft, the essential items required include a CD/DVD, a bottle cap, a balloon, glue or tape, and a pair of scissors. Firstly, groove a small hole right in the middle of the bottle cap. The diameter of the hole should be approximately equal to the diameter of a regular plastic straw. Stick the bottle cap in the centre of the CD/DVD with the help of glue or tape. Inflate the balloon, pinch it from the opening side to hold the air inside, and fix it to the boundary of the bottle cap in such a way that the air present inside the balloon can escape through the hole in the bottle cap easily.  This helps the user learn about various physics concepts such as Newton’s second law of motion, air pressure, the force of friction, the analogy of a hovercraft, etc.

Balloon Hovercraft

16. Egg in a Bottle

To construct this particular physics project model, you need a properly boiled and peeled egg, a glass bottle or container that has a narrow opening, paper, and a source of fire. Place the glass bottle on a flat and rigid surface. Light one end of the paper and place it inside the glass container. Now, place the egg on the top of the glass bottle and wait. The egg would get sucked in despite the opening of the container being narrow. The egg in a bottle physics experiment helps the user observe the relationship between atmospheric pressure, the flow of air from a region of high pressure to low pressure, combustion, and temperature.

Egg in a Bottle

17. Growing Crystals

Growing crystals is a physical phenomenon, typically referred to as crystallization, which the state of matter tends to change directly from liquid to solid form. The materials required to grow crystals at home include a glass container, distilled water, salt, a pencil, and a piece of thread. The first step to perform crystallization is to heat the distilled water up to a temperature that is a little below its boiling point. The next step is to partially fill the glass container with hot water and add salt. The quantity of salt added to the water should be enough to create a saturated solution. A saturated solution is formed when the solute is added to the solvent to the point that the solvent is not able to dissolve the solute any further. Make a loop on one end of the string and tie the other end to a pencil. Place the pencil over the container in such a way that the string gets properly immersed into the solution. Put the arrangement in a warm environment. A few days later, crystals begin to deposit on the string. This particular project helps the user get a better understanding of saturated solutions and the conversion of the state of matter from one form into another.

Growing Crystals

To make a prism, the main items required are distilled water and clear gelatin. The first step to constructing a prism is to pour the powdered gelatin into a container and add half portion of distilled water into it. Place the container on a stove and start heating the solution. Periodically stir the solution to properly dissolve gelatin in distilled water. Pour the solution into a small container and allow it to cool. Now, cut the solidified gelatin in the shape of a prism. Shine a light source from one end of the prism and observe the ray of light break into a spectrum of colours. This particular project would let the user gather knowledge about wavelengths of various colours, properties of visible light and other electromagnetic radiation, solidification process, and many more.

19. Lava Lamp

A lava lamp is yet another simple physics project that one can easily make at home with the help of easily available equipment. The materials required for this particular project include vegetable oil, glass container, food colouring, and salt. Firstly, fill the 3/4th portion of the glass with water and the rest with vegetable oil. Add a few drops of food colouring to the mixture and then slowly pour one teaspoon of salt into the container. Finally, sit back and observe the set-up. Initially, the oil tends to reach the end of the container drop by drop. When the salt properly gets dissolved into the solution, oil begins to slowly rise from the bottom of the container and form a layer on the top of the water, thereby displaying a lava phenomenon. This helps the user understand the viscosity and immiscibility of different fluids.

20. Half ring Vortex 

To make a vortex, you require a circular dish, food colouring, and a pool filled with clear water. First of all, dip the dish into the water and push it in the forward direction. Remove the plate and observe the two rings formed on the surface of the water. Add a few drops of food colouring to one of the rings. Observe that the colour tends to flow from one ring to the other. This indicates that the rings are connected to each other and a half-ring vortex has been formed. By performing this particular physics experiment, the user would be able to understand the construction and properties of a vortex.

21. Archimedes Screw

  To make an Archimedes screw, you need a PVC pipe, duct tape, a pair of scissors, food colouring, water, and clear vinyl tubing. First of all, tape one end of the tube to the pipe. Now, wrap the tube along the length of the pipe to form a spiral. Once the tube covers the whole length of the pipe, cut off the extra tubing with the help of scissors. Tape the other end of the tubing to the pipe. Make sure that the space between the loops of the tube is even. Use duct tape to hold the tube in place. Take an empty container and a container filled with water. Set up the containers in such a way that the empty container is placed at a higher position and the filled container is placed at a comparatively lower position. Dip one end of the Archimedes screw in the lower container containing water and align the other end of the screw over the higher container. Rotate the screw and watch the water travel up the tube. For better visualisation, add a few drops of food colouring into the water. With the help of this particular experiment, the user would be able to understand the physics behind water walking, rotatory motion, and the tendency of matter to flow from a region of higher concentration to a region of lower concentration.

Archimedes Screw

22. Electromagnet

To make an electromagnet, you require a battery, an iron nail, a switch, and insulated copper wire. Firstly, take the insulated copper wire and wrap it over the iron nail. Remove the insulation coating of the wire from both ends. Connect one terminal of the switch to one end of the copper wire. Connect a battery between the free ends of the wire and the switch. Now, if you push the switch and move the nail near ferromagnetic materials, the object gets attracted and stick to the nail. The user can learn a lot about electric current, magnetism, magnetic field, ferromagnetic, paramagnetic, and diamagnetic material, etc., with the help of this particular physics project.

Electromagnet

23. Water Strider

To make a water strider, you require a shallow plate, copper wire, water, food colouring, and a pair of scissors. Cut three equal pieces of copper wire of approximately 6 cm in length. Twist the centre portion of the wire pieces together. Curve the ends of the wire pieces. Make sure the twisting of wire is done properly and the structure is properly balanced. Fill the plate with water up to the brim. Place the water strider on the surface of the water and observe it float. The key concepts that users can learn by making a water strider include surface tension, buoyancy, density, and mechanical force.

Water Strider

24. Earthquake Shake Table

An earthquake shake table is typically used in real life by architects and engineers to test if a particular structure or a building would be able to withstand the jerks of an earthquake. To make an earthquake shake table as a physics project, you require a metallic ruler, rubber bands, duct tape, a pair of scissors, two square-shaped plexiglass sheets, and four small rubber balls of the same size. The first step is to cover the corners of both plexiglass sheets with duct tape. Place one of the plexiglass sheets on the top of another. Attach the two glass sheets together by wrapping rubber bands on the opposite sides about 1 inch away from the edge. Insert four rubber balls between the sheets, one ball for each corner. Place an object on the top of the shake table. Pull the top glass sheet and shake the table to check whether the object is able to withstand the vibrations. The key terms and concepts to learn from this particular project include destruction force, vibratory motion, linear motion, earthquake, tectonic plates, seismic waves, seismometer, etc.

Earthquake Shake Table

25. Gauss Rifle 

A gauss rifle is also known as a magnetic linear accelerator. The materials required to build a magnetic linear accelerator include two similar wooden dowels, neodymium magnets, nickel-plated steel balls, wood glue, clear tape, sand, plastic box, and measuring tape. Firstly, form a slide with the help of wooden dowels. For this purpose, place the dowels next to each other and tape them together to temporarily hold them in place. Use wood glue to permanently fix the two dowels together. Let the glue dry for some time, and then remove the tape. Now, place two ball bearings on the edge of the dowels, and then put one neodymium magnet next to the balls. Fix the magnet in place with the help of clear tape. Place the arrangement on the edge of the table and a sandbox filled with sand on the floor a few feet away from the table. Place another ball bearing on the other side of the magnet about 5-6 cm away. Roll the ball bearing. You will observe that it gets attracted by the magnet and a transfer of energy from the magnet to the balls present on the edge of the dowels takes place. The ball present on the corner gets launched and falls into the sandbox. Use the measuring tape to measure the distance travelled by the steel ball and repeat the experiment by inducing variations in the distance between the magnet and the balls. This project helps the user understand the laws of conservation of momentum, gravitational force, energy, magnetic field, mass, velocity, acceleration, etc.

Gauss Rifle

26. Line Following Robot 

A line following robot is a great idea for a physics project. As the name itself suggests, a line following robot tends to follow a black strip pattern formed on the surface and avoids any other path for movement. To make a line following robot, you require four gear motors, four wheels, Arduino Uno, an infrared sensor, connecting wires, solder, soldering iron, black tape, white chart paper, and battery. Make the connections of the components as per the circuit diagram. Attach the wheels to the output shaft of the gear motors. Connect the terminals of the gear motors to the motor driver. Fix two or more infrared sensors in front of the set-up with the help of glue. Use connecting wires to connect the sensor to the Arduino. Write a program for the line following operation of the robotic vehicle. Attach a USB cable to the USB port of the computer and Arduino board. Now, upload the program. Supply power to the robotic car with the help of a battery. Place the white chart paper on the ground, make tracks on it with the help of black tape. Place the robotic vehicle on the chart paper and observe it move strictly on the black tracks. With the help of this particular project, the user would be able to understand programming, infrared sensors, electric circuits, gear motors, rotatory motion, linear motion, etc.

Line Following Robot

27. Portable Mobile Charger 

A portable mobile charger is one of the simplest physics projects. The components and equipment required to build a portable mobile charger are battery, 7805 voltage regulator IC, resistor, PCB board, battery connector, USB port, connecting wire, LED, solder wire, and soldering iron. Make the circuit on the PCB board and connect the electronic components as per the circuit diagram. Here, the voltage regulator IC helps in the generation of a constant magnitude voltage. The main purpose of the LED connected to the output of the circuit is to confirm the working of the charger. Building a portable mobile charger helps the user know about conduction of current, voltage drop, voltage regulation, conversion of electrical energy into light energy, and various other related concepts.

Portable Mobile Charger

28. Magnetic Slime

To make magnetic slime, you require liquid starch, white glue, iron oxide powder, bowl, spoon, measuring cup, and neodymium magnet. The first step to making a magnetic slime is to pour 1/4 portion of white glue in a bowl. Now, add 2 tablespoons of an iron oxide powder to the white glue and mix them well. Fill 1/8th portion of the measuring cup with liquid starch and add it to the mixture. Stir well to form slime. Knead the slime with bare hands. Now, bring a ferromagnetic object near the magnetic slime, the slime tends to get attracted, and covers the object from outside. This particular project demonstrates the magnetic behaviour of objects.

Magnetic Slime

29. Junk Bot

A junk bot is a simple physics project that one can build at home with the help of waste items such as cardboard, plastic straws, ice cream sticks, metal cans, etc. The important tools required to build a junk bot include pliers, motor, screwdriver, battery, battery holder, connecting wires, tape, cork, a pair of scissors, and glue. The first step is to insert the batteries into the battery holder. Then, attach the battery holder terminals to the terminals of the motor. Fix a cork on the shaft of the motor. Turn on the battery’s switch. Check whether the motor and the cork are vibrating. Make the body of the robot with the help of waste items available. Attach the battery and the motor along the length of the robot near the base. Place the robot on the floor, turn on the switch, and observe it moving forward. You can also make two such robots and use them to wrestle against each other for entertainment purposes. This particular physics project would help the user gain knowledge about the basics of robotics, the function of a motor, and the importance of reusing waste materials.

30. Clap Switch

Clap switch has a basic operation of turning on and off the working of certain gadgets such as the luminance of a light bulb on hearing a clap sound. It typically consists of an assembly of electronic components such as IC- LM555, a battery, battery holder, resistors, transistors, capacitors, microphone, and a light-emitting diode. The tools required for the construction include solder wire, soldering iron, printed circuit board, tweezers, and connecting wires. To begin with, assemble and connect all the components as per the circuit diagram. Use a jumper wire to connect pin number 4 of the LM555 IC to pin number 8. Similarly, connect the positive terminal of the 10 microfarad capacitor to pin 6 and 7 and the negative terminal to pin1 of the IC. The next step is to connect a 100 k ohm resistor between the positive pin of the capacitor and pin 8 of the IC. Make the connections of the transistor pins with the IC such that the emitter pin of the transistor is connected to pin 1 of the IC and the collector pin is connected to pin 2. Complete the rest of the circuit by connecting the battery and microphone. Test the working of the project. This helps the user to know about the basic operation of electronic components, flow of electric current, voltage drop, etc.

Clap Switch

31. Rain Alarm

To make a rain alarm, first of all, gather the components such as a BC547 transistor, a buzzer, battery, battery clipper, PCB, LEDs, connecting wires, solder wire, soldering iron, wire clipper, and tweezers. Print the schematic diagram of the rain alarm circuit. Short the rows of the printed circuit board according to the schematic diagram. Connect the positive terminal of the buzzer to the emitter pin of the transistor with the help of solder wire. Solder the positive terminal of the LED to the negative pin of the buzzer. The next step is to connect a battery clipper between the collector pin of the transistor and the LED. The connection should be made in such a way that the negative wire of the battery clipper is attached to the negative terminal of the LED and the positive wire is connected to the collector pin of the transistor. The final step is to connect the printed circuit board with the collector and base pin of the transistor. To test the circuit, pour a few drops of water onto the PCB. The LED glows, and the buzzer makes an alarming sound. This project helps us know the working of buzzer and other electronic components.

32. Water Level Indicator

A water level indicator is a common gadget that is used in our daily life to keep the tank of water from overflowing. Interestingly, one can easily make it at home with the help of easily available components and materials. The basic equipment required to build a water level indicator includes BC547 transistors, 100 Ohm resistors, a battery, battery cap, PCB, switch, LEDs, and rainbow cable. The tools essential for its construction include a soldering iron, solder wire, wire clipper, and tweezers. Assemble and solder the electronic components on the printed circuit board according to the circuit diagram. It helps the user understand the working of a transistor, conduction of current, voltage drop, emission of light, and many more concepts.

Water Level Indicator

33. Gas Leakage Detector

A gas leakage detector is an expensive gadget available in the market that can be constructed at home easily with the help of basic electronic components. The components used in this particular project include a voltage regulator IC, a dual comparator IC, rectifier diodes, NPN transistor, resistors, pot, electrolyte capacitors, transformer, buzzer, LPG sensor, LCD display, and a two-pin connector terminal. The first step to making this particular project is to download the component layout and place it on the printed circuit board. Now, attach the components according to the layout. Use solder wire to fix the components in place. Make the circuit tracks properly and cut off the extra wires and terminals of the components. Make sure the circuit is as compact as possible. Place the project in the desired location and use a broken gas lighter to test the work. By making a gas leakage detector, the user would have a better understanding of the sensors, buzzers, and other electronic components.

Gas Leakage Detector

34. Light Tracking Robot

A light tracking robot typically follows the light radiation and moves in its direction. To make such a robotic vehicle, you require two wheels, one castor wheel, robotic vehicle chassis, light-dependent resistors, motor, soldering iron, soldering wire, glue gun, PCB, screws, and screwdriver. The first step to building a light-seeking robot is to assemble the electronic components on the printed circuit board as per the circuit diagram. The positive terminal of the battery is connected to one side of each of the light-dependent resistors. The leisure ends of the light-dependent resistors are connected to the motors. The leisure or the free terminals of the motors are connected to the negative terminal of the battery. Assemble the printed circuit board to the vehicle chassis. Fix the wheels to the motor shafts. Attach a castor wheel to the middle of the chassis to add balance to the structure of the robotic vehicle. Use a flashlight to test the working of the light-seeking robot. This particular project helps the user know about various electronic components, circuit connections, functioning of motor, and the working of light-dependent resistors.

Light Tracking Robot

35. Surprise Glitter Box

A surprise glitter package is a common physics project that one can easily make with the help of a motor, a battery, battery holder, cardboard box, alligator clips, glitter, glue, tape, limit switch, craft paper, and a pair of scissors. First of all, connect the battery to the motor by either twisting the wires together or with the help of alligator clips. For the basic operation of the surprise glitter box, a limit switch, also known as the lever switch, is used. A limit switch typically consists of three terminals, two of which form a connection that is normally open if the switch is pressed and gets closed when the lever is not pressed. The limit switch is required to be placed inside the box carefully in such a way that the lever is depressed when the box is closed to make sure that the motor does not work until the box opens. Now, take a piece of craft paper and cut it into the shape of a circle. Make a cut along the radius of the circle and fold it into a conical shape. Attach four paper cut-outs shaped like a rectangle folded at 90 degrees inside the cone at equal distances. Finally, fix the paper cone to the motor shaft with the help of a hot glue gun. Place the motor inside the cardboard box at an appropriate height. Pour glitter into the paper cone and close the lid. This particular project would help the user understand the functioning of the motor, working of a limit switch, rotatory motion, and various other concepts.

Surprise Glitter Box

36. Syringe Robotic Arm

For the construction of a hydraulic robot arm, you need a thick cardboard sheet, 8 syringes, a vinyl tube, toothpicks, glue, a knife, masking tape, and a pair of scissors. The first step is to cut the cardboard to form the structure of the robotic arm, the grip, and the base. Now, drill holes into the designated areas. Fix the parts of the robotic arm together with the help of toothpicks. Cover the edges of the cardboard with masking tape. Attach four syringes to the arm in such a way that there exists sufficient space for the joint to move. Use a cardboard piece and an old pen cap to build the rotating platform. Fix the vinyl tube in the places where the motion of the robotic hand and gripping of objects are desired. This helps the user understand the hydraulic conduction, pressure, and rotation.

Syringe Robotic Arm

37. LED Cube

A light-emitting diode cube is yet another interesting physics project that one can easily make at home. It typically requires a printed circuit board, resistors, LEDs, solder wire, Arduino Uno, bakelite sheet, cutter, pencil, drill machine, and connecting wires. Firstly, cut the bakelite sheet in the shape of a small square. Make a 3 x 3 grid on the face of the sheet and drill holes on the intersection points. Make a small loop at the negative or the cathode terminal of all the LEDs. Shorten the length of the LED terminals by cutting out the extra portion. Temporarily attach the LEDs inside the holes drilled on the bakelite sheet. Connect all the anode terminals of the LEDs together with the help of connecting wires and solder. Firmly push the LEDs outwards and remove the resultant structure of the LEDs joined together from the bakelite sheet. Make a few more such structures with similar dimensions and connections. Stack the structures on top of one another and fix them at equal distances. A cube of LEDs gets formed. Now, connect all the cathode terminals of the LEDs together. Connect the LED cube onto the PCB. Make a connection for the Arduino Uno adjacent to the LED cube. Connect one resistor to each layer of the LED cube. Now, connect the LED cube to the Arduino board. Write the program in the programming software and load it into the Arduino board. Turn on the power supply and test the working of the project. This project helps the user build an understanding of the electrical connections, programming, working of Arduino, and various electronic components.

38. Air Pump

The materials required to make an air pump include a plastic container, a knife, a pair of scissors, a balloon, and tape. The first step is to make a small hole in the cap of the plastic container. Make sure that the hole is situated right in the middle of the lid. Cut a small rectangular piece from a balloon. Cover the hole with the rectangular strip and tape two of its opposite ends. Properly glue the lid to the container, so that there exists no leakage. Poke a tiny hole on the surface of the plastic container. Wrap the balloon to be inflated on the cap, place a finger on the tiny hole, and start repeatedly pressing the container. The balloon gets inflated. By making an air pump, you would be able to understand the atmospheric pressure, the basic properties of matter, compression force, working of a valve, unidirectional flow of air, expansion and ability of elastic objects to change shape, etc.

To make a magnet, you require a few iron nails and a magnet. Firstly, hold the magnet in a fixed position. Now, start rubbing the iron nail along the length of the magnet in a particular direction. Make sure that the direction of strokes provided to the magnet is fixed, i.e., either from North to South or from South to North ends of the magnet. Perform the strokes on the magnet about 45-50 times. Finally, bring the magnetized iron nail around a ferromagnetic substance. The nail and the substance get attracted towards each other. This helps the user understand the magnetic induction, magnetic behaviour of objects, and unidirectional alignment of the dipoles of an object.

40. Windmill Working Model

A working windmill model is a common physics project that one can build with the help of easily available equipment such as cardboard, thermocol, glue, a pair of scissors, a motor, a battery, and a battery holder. The first step to making the working model of the windmill is to make the base structure of the windmill. For this purpose, fold the cardboard sheet in the shape of a cone and stick it on the top of thermocol sheet. Make sure the cone is properly glued and does not move. Now, make the wings of the windmill. Cut out four equal-sized wings from the cardboard sheet and pin them together on a small circular cardboard cut-out. Drill a small hole on the top of the cone along the curved surface a few centimetres below the top point. Connect the battery holder wires to the wires of the motor. Fix this arrangement of motor and battery holder on the conical base in such a way that the motor shaft easily passes through the hole. Glue the fan of the windmill to the shaft of the motor. Make sure the motor shaft and the fans rotate smoothly. Attach the battery and observe the working of the model. Decorate the surroundings of the model appropriately by placing the miniature cardboard models of objects present in a real windmill farm. This physics project allows the user to easily demonstrate the working of a windmill, generation of energy, working of motors, conduction of current, and transfer of energy.

Windmill Working Model

41. Automatic Street Light

An automatic street light glows when a vehicle is present nearby, and it shuts down when there is no traffic. The essential electronic components to form an automatic street light model include a transistor, LEDs, LDR, resistor, printed circuit board, battery holder, switch, and battery. The tools required for the construction include solder iron, solder wire, and wire stripper. First of all, solder the transistors onto the printed circuit board. Connect the emitter pin of both the transistors to the negative terminal of the battery holder. Now, connect the collector pin of transistor-1 to the base pin of transistor-2. Connect a resistor between the positive terminal of the battery and the collector pin of transistor-1. Finally, connect the light-dependent resistor between the base pin of transistor-1 and the positive terminal of the battery clip. Complete the rest of the circuit as per the circuit diagram. Connect a resistor between the base pin of transistor-1 and the negative terminal of the battery. Now, connect another resistor between the positive terminal of the battery and the anode pin of the LED. Finally, connect the cathode terminal of LED to the collector pin of transistor-2. Attach the circuit to a model of a street in such a way that the LDR has enough exposure and the LEDs are fixed in place. Verify the working of the project. It helps the user understand the working of light-dependent resistors, circuit connections, voltage drop, and the operation of the transistor as a switch.

Automatic Street Light

42. Electromagnetic Induction Model 

To make a working model that displays electromagnetic induction in real life, you require an LED, a transistor, a resistance, a battery, tape, battery clip, and copper wire. The first step is to wrap the copper wire around a cylindrical object 40-50 times to form a thick metal coil. Follow the same procedure to make another coil. Make sure that the second coil consists of the same number of turns and a loop right in the middle, i.e., after 20 turns. Remove the insulation coating a few inches from the end of the wire. Take the first coil and connect the terminals of an LED to the coil terminals. Now, connect the middle pin of the transistor to a 15k resistor. Take the second coil that consists of a loop wire. Connect one end of the coil to the first pin of the transistor and the other end to the free end of the resistor. Connect a battery cap between the loop wire of the second coil and the third pin of the transistor. Make sure the positive terminal of the battery is connected to the loop wire, while the negative terminal is connected to the third pin of the transistor. Solder and fix the connections permanently. Fix the arrangement on a piece of hard cardboard. Use double-sided tape to vertically fix the battery and the coil on the top of the board. Attach the battery clip to the battery. Move the coil that is connected to the LED near the circuit. The LED glows, thereby verifying the existence of electromagnetic induction.

Electromagnetic Induction Model

43. Thermal Insulator

To make a thermal insulator at home, you need three glass jars, a woollen scarf, paper, aluminium foil, a pair of scissors, tape, hot water, fridge, thermometer, bubble wrap, and stopwatch. Cut a rectangular piece of aluminium sheet, paper, and bubble wrap. Each cut out should be long enough to wrap the glass jars about three times. Firstly, cover one of the jars with aluminium foil three times. Fix the end of the aluminium foil in place with the help of tape. Now, in a similar manner, wrap the bubble wrap and paper around the jar. Now, take another jar and wrap it completely in a woollen scarf. Leave the third jar unwrapped. Fill all the jars with hot water. Use a thermometer to note the initial temperature of the water. Close the lids of the jar and place the properly sealed jars in a refrigerator. Take out the jars after 10 minutes and note the final temperature of the water. Observe which of the jars provide the best thermal insulation. This simple project helps the user understand the concept of convection, thermal insulation, conduction, the correlation between the thickness of the insulation layer and temperature, and heat energy.

Thermal Insulator

44. Solar Panel 

The essential materials required to make a solar panel include a printed circuit board, ferric chloride solution, solder, solder iron, alcohol, and crystal silicon paste. Draw the connections of the solar panel on the printed circuit board with the help of a marker. Pour ferric chloride solution into a container. Immerse the printed circuit board into the ferric chloride solution and perform the etching process. Place the container containing the printed circuit board in sunlight to speed up the process. Now, take out the printed circuit board and clean it with alcohol. Make connections on the board with the help of solder wire and soldering iron. Apply crystal silicon paste over the printed circuit board and leave it to dry. Remove the extra paste from the printed circuit board. Attach the connecting wires to form the positive and negative terminals of the solar panel. Place the set-up in direct sunlight and connect a multimeter across the terminals. Observe the voltage developed and confirm the working of the solar panel. By building this particular project, the user is able to understand the internal working of a solar panel and the conversion of light energy into electrical energy.

Solar Panel

45. Writing Machine 

The essential materials required to build a writing machine are wooden blocks, glue gun, rubber bands, drill machine, stepper motor, iron rod, pencil, Arduino Uno, stepper motor driver, USB cable, laptop/PC, and metal gear servo. The first step is to cut out a rectangular piece from the wooden block. Now, cut two small rectangular pieces of wood having a length equal to the width of the main or base wooden block. Drill two holes about 3 cm away from the edge on both of the small rectangle-shaped wooden pieces. Stick one of the small rectangular wooden pieces on the edge of the base plate and the other block a few inches away from the other edge. Place the stepper motor on the base plate in such a way that the shaft of the motor easily passes through the hole of the small rectangular plate. Pass an iron rod through the hole of the block present on the edge of the base plate and connect another end of the rod to the motor shaft. Insert a pencil through the free holes of both the small rectangular blocks. Make a similar structure. Place it horizontally on the main structure and glue it in place. Attach the electronic components to the Arduino board and make the circuit. Provide power supply to Arduino Uno. Fix the pen in position. Adjust the height of the pen according to the paper. Connect the Arduino Uno board to a laptop or PC with the help of a USB cable and load the program. Finally, test the working of the project. This particular project helps the user know about the Arduino board, electrical circuits, programming, working of a stepper motor, linear motion, etc.

Writing Machine

A drone or a quadcopter is a prominent physics project one can build with easily available materials. The equipment and materials necessary to build a drone include metal/plastic/wooden sheets, motors, propellers, battery, RC receiver, electronic speed control, zip ties, connecting wires, screws, screwdriver, solder wire, wire stripper, and soldering iron. First of all, design the frame of the quadcopter. Now, drill holes into the frame and assemble the motors. Make sure that the shaft of the motors is able to rotate freely. Connect the electronic speed controllers to the base of the drone. Use zip ties to make sure the electronic speed controllers are properly fixed to the frame and do not fall off during the flight. The landing of the quadcopter is an essential phase, hence the landing gear is required to be positioned appropriately. Assemble the controller on the top of the drone and connect it to the remote control. Test the flight and landing of the device. This project would certainly help the user learn about air resistance, uplift force, aerodynamics, remote control operation, and rotatory motion.

47. Earthquake Alarm 

The essential components required to build an earthquake alarm include a battery, battery cap, buzzer, safety pin, switch, cardboard sheet, nut and copper wire. The first step is to attach an inverted ‘L’ shaped cardboard cutout vertically in the middle of a cardboard sheet with the help of glue. Now, glue a safety pin in the middle of the ‘L’ shaped cardboard in a horizontal direction. Attach a nut to the end of a copper wire. Pass the wire through the loop of the safety pin and fix it on the top of the structure. Allow the nut to hang freely. Connect the buzzer to the switch, free end of the copper wire, and the battery clip. To test the working of the project, turn on the switch and lightly shake the structure. The buzzer starts to produce an alarming sound indicating the possibility of an earthquake. This project assists the person to learn about the reason behind the occurrence of an earthquake, seismic waves produced by the earth, seismometer, working of a buzzer, and connection of electronic components.

Earthquake Alarm

48. Water Dispenser 

To make a water dispenser at home, you require a cardboard box, glue gun, knife, plastic bottle, vinyl tubing, and a container. The first step is to drill a hole on the curved surface of the plastic bottle, a few inches above the base. Now, insert the vinyl tube into the hole. Place the bottle into the cardboard box. Poke a small hole on the front side of the cardboard box. Pass the pipe connected to the bottle through the hole made on the cardboard box. Place a container in front of the cardboard box under the pipe. Pinch the end of the pipe and pour the liquid into the bottle. Close the lid of the bottle. Twist the cap in a clockwise direction and observe that the liquid gets poured into the container. By making a water dispenser, the user would be able to understand the basics of pressure, the flow of liquids, and the Brownian motion of water molecules.

Water Dispenser

49. Propeller LED Pendulum Clock

A propeller LED pendulum clock is yet another common Arduino based project. One can easily build it with the help of electronic components such as LEDs, resistors, a transistor, Arduino Nano, IR receiver sensor, connecting wires, hall sensor, switch, capacitors, battery, USB cable, magnet, DC motor, printed circuit board, etc., and tools such as solder wire, soldering iron, wire clipper, and tongs. First of all, arrange all LEDs on the printed circuit board in a straight line and solder them in place. Connect resistors to the LEDs. Now, make the rest of the connections as per the circuit diagram. Solder the female header connectors onto the printed circuit board. Attach the Arduino nano board to the electronic circuit. The cathode terminal of the LEDs is connected to the ground terminal of the Arduino board. Make sure the cathode terminals of all of the LEDs are shorted. Connect the resistors to the 5V pin of the Arduino board. Make appropriate connections between resistors and the analogue/digital pins of the Arduino Nano board. Connect switch and battery to the circuit. Attach the IR receiver to the board and fix it in place with the help of solder wire. Attach the ground pin of the IR receiver to the ground of the circuit. Now, connect a 100-ohm resistor to the VCC pin of the IR receiver and a 100 microfarad capacitor between the VCC and ground pin of the sensor. Fix one end of a connecting wire to the output pin of the IR receiver sensor and the other end to the receiver pin of the Arduino Nano. Solder the hall sensor to the printed circuit board. Connect VCC pin, ground pin, and output pin of the Hall sensor to 5V pin, ground pin, and D2 pin of the Arduino Nano board. Verify the circuit connections according to the circuit diagram. Drill a hole in the middle of the printed circuit board and attach the motor in such a way that the motor shaft easily passes through the hole and the board is free to rotate. Add balancing weight to one end of the board. Attach the Arduino Nano board to a laptop or PC with the help of a USB cable and load the code. Turn on the switch and bring a piece of a magnet near the hall sensor. Observe that the LEDs begin to glow. Now, fix the circuit on a wooden structure that has a small magnet fixed on one side. Test the working of the project. This particular project would help the user know about hall sensor, IR sensor, conversion of energy from one form to another, magnetic field, programming, Arduino Nano, circuit connections, voltage, voltage drop, and various other concepts.

Propeller LED Pendulum Clock

50. Data Transmission using Li-Fi

Li-Fi stands for Light fidelity. It is a technique that enables high-speed data transmission. To make a Li-Fi based data transmission system you require two broken pairs of wired earphones, wire stripper, solar panel, LED, resistor, battery clip, solder wire, soldering iron, and wire stripper. The first step is to cut and separate the connector of the earphones from the earbuds. Now, use a wire stripper to remove the insulation. You can observe that the earphone wire comprises four wires. One of the wires is the ground wire, while the rest three are for audio, right speaker, and left speaker. Clip the audio wire and join the speaker wires by twisting them together. Obtain two such arrangements. Connect the twisted wires to the positive terminal and the ground wire to the negative terminal of the solar panel. Take the other similar arrangement. Attach a battery clip to the speaker wire and a 220ohm resistor. Now, connect an LED between the ground wire and the free terminal of the resistor. Attach the battery to the battery clip. Insert the wire connected to the LED circuit into the earphone jack of a mobile phone and the wire connected to the solar panel to a speaker. Play a song on the mobile phone and observe the working of the circuit. This particular project helps the user learn about LI-FI technology and the transmission of data.

Data Transmission using Li-Fi

51. Ropeway Model

To make a ropeway model, the user requires a thick cardboard sheet, a pair of scissors, glue, tape, DC motors, and a rope or string. First of all cut four rectangle shape cardboard strips of equal dimensions. Attach a dc motor on one end of the rectangular strip. Cover the motor by forming a cuboid shape using cardboard around it. Form a closed electronic circuit by connecting a switch to the motor and a battery clip. Glue the switch and the battery on the top of the cuboid. Cut three circles out of the cardboard sheet, neatly stack them, and glue them together in place. Make sure that the circle present in the middle has a smaller diameter than the diameter of the two circles present on the boundary. Drill a hole in the middle of the three circles and fix it over the motor shaft. Make another cuboid box and circles with the help of cardboard having the same dimensions as the previous ones. Place both the cuboids opposite to each other and properly glue them in place. Make sure the height of the circles present on the top of the cuboids is the same. Wrap a string around the inner circle of both structures. The string should have a sufficient amount of tension in it. Attach two small cardboard boxes to the string and turn on the switch. The motor begins to rotate the shaft. The shaft transfers rotatory motion to the circular structure, which in turn causes the string to move. This particular project is helpful as it explains various physics-related concepts such as the working of a motor, transfer of momentum, inertia, rotary motion, and tension.

Ropeway Model

52. Hand Water Pump 

To make a hand water pump at home, you need a 60ml syringe, a 5ml syringe, copper tubes (5mm and 8mm), iron strips, foam valve for water pumps, bearing balls, iron nail, washer, plier, drill machine, cutter, nut bolts, and a plastic container. The first step is to remove the plunger from the syringe. Now, cut the foam valve in the shape of a circle that has a diameter equal to that of the barrel. Put the foam valve into the empty barrel of the syringe. Make sure that the valve is able to move up and down with ease. Now, remove the rubber part attached to the plunger and replace it with the valve. Now, drill two holes located opposite to each other on the top of the plunger rod. Cut the plunger into two halves. Take a copper rod and compress its ends with the help of a plier. Now, drill a small hole on one end of the copper rod and two holes on the other end of the rod. Attach the rod to the plunger by drilling holes and inserting nuts and bolts through the holes present on the copper rod and the plunger. Take a metal strip and wrap it around the curved surface of the syringe barrel. Leave a few inches on both the ends of the metal strip. Align the ends of the metal strip along a straight imaginary line and drill two holes through them. The next step is to take two pieces of metal strip, fold them along the length, and drill a hole at both ends of each metal strip. Use a grinder to curve the shape of the ends of the metal strips. Attach the curved metal strip to the surface of the syringe barrel and fix it in place with the help of nuts and bolts. Make a small hole in the top corner of the syringe barrel. Take a 5ml syringe and remove its plunger rod. Cut the front portion of the barrel and glue it over the hole made on the curved surface of the 60ml syringe barrel. Now, take another copper tube. Make a hole on the end of the tube and another hole a few inches away from the same end. Take the middle portion of the foam valve and cut it in such a way that you have two circles. Insert a washer in between both the circles and pass an iron nail through the arrangement. Place it into the 60ml syringe barrel. Now, insert the plunger that contains the foam valve and is connected to the iron rod into the 60ml syringe barrel. Drop a bearing over the plunger. Seal the top of the barrel with the help of a circular plastic cut out. Attach the two metal strips and the copper rods together with the help of nuts and bolts. Use another nut and bolt to fix the curved rectangle shape metal strip to the copper rod. Pour water into the plastic container and dip the hand pump into it. Fix the handpump over the lid of the container with the help of a hot glue gun. Test the working of the project. This particular project would help the user understand the fluid mechanics, pressure, positive displacement principle, kinetic energy, mechanical energy, movement of fluids from a region of high pressure to a region of low pressure, etc.

Hand Water Pump

53. Bubble Machine 

A bubble machine is yet another example of a simple physics project. To make a bubble machine at home, you require a plastic tube, a pair of scissors, plastic straws, a marker, tape, bottle cap, DC motors, battery, battery holder, propeller, USB, USB charger, electrical tape, and cardboard box. First of all, use a marker to make markings on the plastic tube. Make sure the markings are located at equal distances from each other. Now cut the tube along the marks to obtain congruent hollow cylindrical pieces. In a similar manner, cut the straws and obtain equal length hollow cylindrical pieces. Attach the straw pieces to each other in the shape of a star. Now, attach the plastic tube pieces to the end of the straw pieces arranged in the form of a star. Glue a bottle cap to the centre of the star-shaped pattern to form the bubble wheel. Take a DC motor and connect it to a battery holder. Fix the motor shaft to the bottle cap. The next step is to take a propeller and cut it into the desired size. Take another DC motor. Connect the motor to a USB charger. Attach the propeller to the motor shaft. Fix the motor on a cardboard box. Form the soap solution by dissolving shampoo, liquid dish wash, or liquid handwash into water. Pour this soap solution into a plastic container. Fix the motors on the lid of a plastic container. Make sure the motor connected to the plastic straw and tubes is fixed over the lid of the plastic container in such a way that the star pattern is properly immersed into the liquid present inside the container and is able to move easily. The propeller should be placed in such a way that the air circulated by the propeller directly passes through the plastic tube pieces. Check the motor connections and place an electrical tape over the joints. Turn on the power supply and test the working of the project. This helps the user understand the working of motors, propellers, circulation of air, surface tension, formation of bubbles, and the reason behind the tendency of the bubbles to maintain a spherical shape.

Bubble Machine

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10 comments.

Seriously these are very nice projects. It is very helpful to do our project homework. These are very brilliant idea and some of them are also hard but they are very good.

THESE PROJECTS ARE GOOD , EASY AND HELPFUL

I CAN ONLY IMAGINE WHAT I WAS GOING TO DO WITHOUT THESE BRILLIANT IDEAS THNX ALOT BUT ANYWAYS THEY ARE VERY HARD NUTS TO CRACK.

Cool projects

These are very nice projects. Can any one state to me what is used to design the circuits?

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Easy Physics Experiments For Kids

These easy physics experiments are fantastic for kids; you can even do them at home or with groups in the classroom. Whether you are exploring laws of motion, sound waves, or light, physics is everywhere! Make sure to check out all of our science experiments for all year-round learning and play.

What Is Physics for Kids?

Physics is, most simply put, the study of matter and energy and the interaction between the two .

Physics is like the rulebook of the universe. It helps us understand how everything around us works, from tiny atoms to the vastness of space. When we study physics, we learn about motion (like why things move), forces (like pushes and pulls), energy (what makes things happen), electricity, magnetism, and more. It’s like solving puzzles about how the world functions.

Kids can learn more about the world around them through fun physics experiments like the ones below and deep thinking!

Try this Physics Project:

Physics Experiments By Topic

If studying a specific physics topic, check out these additional resources below. Each topic includes easy-to-understand information, everyday examples, and additional hands-on activities and experiments for you to use.

• Static Electricity
• Potential and Kinetic Energy
• Forces & Motion
• Simple Machines
• Light Energy
• Capillary Action
• Surface Tension

Click here to get your FREE Physics Activity Guide!

You will love these neat physics project ideas we have to share with you. I handpick my selections based on what I think my son would enjoy, what supplies are needed, and what amount of time needs to be dedicated to each activity.

💡 Click on each link for the full descriptions of each experiment and activity.

AIR PRESSURE CAN EXPERIMENT

Learn about atmospheric pressure with this incredible can crusher experiment. 

AIR RESISTANCE EXPERIMENT

Whoa! A physics experiment in under 10 mins and all you need to do is go raid the computer printer! Make simple air foils and learn about air resistance.

AIR VORTEX CANNON

Make your own homemade air cannon and blast down dominoes and other similar items. Learn about air pressure and the movement of air particles in the process.

BALANCING APPLE EXPERIMENT

Explore balancing apples and gravity with real apples for our  Ten Apples Up On Top Dr Seuss theme. Also try to balance a paper apple (use our FREE printable template to make your own).

BALLOON CAR

Here are two balloon car design suggestions to get the creative juices flowing! You can make a LEGO balloon car or you can make a cardboard balloon car . Both work off of a similar principle and really go. Find out which makes the fastest balloon car.

BALLOON ROCKET

Explore fun forces with an easy to set up balloon rocket project. Also see our Valentine’s Day version ; we have a Santa balloon rocket too! This simple experiment can be turned into any fun theme. You can even race two balloons or set it up outside!

BENDING WATER

Can you bend water? Yes, you can with static electricity. Grab a balloon and some water to set up this easy physics experiment.

BROKEN TOOTHPICK

Is it magic, or is it science? Make a star out of broken toothpicks by only adding water, and see capillary action at work.

Pennies and foil are all you need to learn about buoyancy. Oh. and a bowl of water too!

CAPILLARY ACTION

Check out these fun ways to demonstrate capillary action. Plus, all you need is a handful of standard household supplies.

COLOR CHANGING FLOWERS

Learn about the forces of capillary action as you change your flowers from white to green. Or any color you like! Easy to set up and perfect for a group of kiddos to do simultaneously.

COLOR WHEEL SPINNER

Famous scientist Isaac Newton discovered that light is made up of many colors. Learn more by making your spinning color wheel! Can you make white light from all the different colors?

DANCING SPRINKLES EXPERIMENT

Explore sound and vibrations when you try this fun dancing sprinkles experiment with the kids.

DENSITY TOWER EXPERIMENT

Explore how some liquids are heavier or denser than other liquids with this super easy physics experiment.

DROPS OF WATER ON A PENNY

How many drops of water can you fit on a penny? Explore surface tension of water when you try this fun penny lab with the kids.

EGG DROP PROJECT

Check out our mess-free version of a classic science experiment. This egg drop challenge is a great way to introduce kids to the scientific method as you test out ideas to protect your egg from cracking.

EGG IN A BOTTLE

This egg in a bottle project is a fun way to learn about how changes in air pressure can result in a fascinating and almost magical outcome. Watch a boiled get sucked into a bottle without even touching it!

Let the egg race experiments begin! Which egg will roll to the bottom of the ramp first? Help your kids make predictions as to what will happen with different size eggs and different angles of ramps.

Older kids may also find learning about Newton’s 3 Laws to be interesting, and explore how they can apply those ideas to their egg races.

ELECTRIC CORNSTARCH

Can you make oobleck jump? Learn about static electricity with this fun cornstarch and oil experiment.

FLOATING ORANGE

Investigate whether an orange floats or sinks in water, and even add in the scientific method. Learn about buoyancy and density with a simple ingredient from the kitchen, an orange.

FLOATING PAPERCLIP EXPERIMENT

How do you make a paperclip float on water? This is an awesome   physics activity for young kids and older ones too! Learn about surface tension of water, with a few simple supplies.

FLOATING RICE

Can you lift a bottle of rice with a pencil? Explore the force of friction with this easy physics experiment.

GLOWING SPINACH

Transform ordinary spinach that you eat into a glowing green mixture under ultraviolet light! Learn about the pigments present in plants, particularly chlorophyll and how certain pigments can absorb light at one wavelength and emit light at another, resulting in the observed glow.

Learn about the gravity and the force that keeps us firmly planted on the ground with hands-on and engaging activities for kids. Check out these fun preschool gravity activities and gravity experiments for elementary and older .

HOMEMADE COMPASS

Learn about magnets and magnetic fields with this fun and easy DIY compass project. Build your own compass that will show you which way is north.

HOW DO SHARKS FLOAT

Or why is it that sharks don’t sink in the ocean? Learn about how these great fish coast around through the ocean and buoyancy with this simple physics activity.

Check out more awesome Shark Facts for Kids (Free Printable)

HOW TO MAKE RAINBOWS

Explore light and refraction when you make rainbows using a variety of simple supplies—awesome hands-on science for kids of all ages.

KALEIDOSCOPE FOR KIDS

Learn how to create a kaleidoscope for simple physics.

KITE BUILDING

A good breeze and a few materials are all you need to tackle this Kite making physics project at home, with a group or in the classroom. Learn about forces needed to keep a kite up in the air, as you fly your own kite.

Explore physics with common items found around the house. A homemade lava lamp (or density experiment) is one of our favorite science experiments for kids.

Design a parachute and investigate how factors such as parachute size, shape, and material affect its descent time. Also try our LEGO parachute for a mini-fig!

LEGO ZIP LINE

Can you set up a LEGO zip line and see how well it holds up when in motion? This LEGO® building challenge is also a great way to introduce gravity, friction, slope, energy, and motion while getting creative with your LEGO® design. You could also add a pulley mechanism like we did here for this toy zip line .

LEMON BATTERY

What can you power with a lemon battery? Grab some lemons and a few other supplies, and find out how you can make lemons into lemon electricity!

MAGNETIC COMPASS

Use a magnet to make a compass , or combine the science of magnets with paint for a STEAM project!

MAGNIFYING GLASS

Here’s how you can make your own homemade magnifying glass from a plastic bottle and a drop of water. Find out how a magnifying glass works with some simple physics.

MARBLE RUN WALL

Pool noodles are amazing and cheap materials for so many STEM projects. I keep a bunch on hand all year-long to keep my kid busy. I bet you didn’t know how useful a pool noodle could be for physics projects. Learn about gravity, friction, energy and more with hands-on physics fun!

YOU MAY ALSO LIKE: Cardboard Tube Marble Run

MARBLE VISCOSITY EXPERIMENT

Grab some marbles and find out which one will fall to the bottom first with this easy viscosity experiment.

PADDLE BOAT DIY

Learn about kinetic and potential energy with this simple paddle boat project.

PAPER HELICOPTER

Make a paper helicopter that actually flies! This is an awesome   physics challenge for young kids and older ones too. Learn about what helps helicopters rise into the air, with a few simple supplies.

PAPER ROCKET

Kids will love making this simple paper rocket using our free rocket template and a straw. Explore simple physics with gravity, propulsion, energy, and aerodynamics while having a blast!

Build a simple pipeline from cups and straws, and observe how water moves through it because of gravity.

POPSICLE STICK CATAPULT

Want to learn how to make a catapult with popsicle sticks? This  Popsicle stick catapult design is an easy physics experiment for kids of all ages! Everyone loves to launch stuff into the air.

We have also made a spoon catapult , LEGO catapult , pencil catapult , and a jumbo marshmallow catapult !

LEGO RUBBER BAND CAR

We made a simple LEGO rubber band car to go along with our favorite superhero book. Again these can be made as simple or as detailed as your kids would like to make them, and it’s all STEM!

PENNY SPINNER

Make these fun paper spinner toys out of simple household materials. Kids love things that spin and spinning tops are one of the earliest toys made in the US.

POM POM SHOOTER

Similar to our snowball launcher further on, but this physics activity uses a toilet paper tube and balloon to launch pom poms. How far can you fling them? See Newton’s Laws of Motion in action!

POP ROCKS EXPERIMENT

We tested a variety of fluids all with a unique viscosity for this fun pop rocks science experiment. Grab a few packs of pop rocks and don’t forget to taste them too!

POTATO LIGHT BULB EXPERIMENT

Explore how potatoes can power a light bulb! This physics experiment is a fantastic way to introduce kids to electricity and circuits.

RAINBOW IN A JAR

This water density experiment with sugar uses only a few kitchen ingredients but produces an amazing physics project for kids! Enjoy finding out about the basics of color mixing all the way up to the density of liquids.

RISING WATER EXPERIMENT

Add a burning candle to a tray of water, cover it with a jar, and watch what happens!

ROLLING CAN

Another fun way to demonstrate static electricity. Check out this easy physics experiment with an aluminum can and a balloon.

ROLLING PUMPKINS

It doesn’t get much easier than pumpkin rolling on homemade ramps. And what makes it even better is that it’s also a great  simple physics experiment for kids. 

RUBBER BAND CAR

Kids love building things that move! Plus, it’s even more fun if you can make a car go without just pushing it or by adding an expensive motor. 

SALT WATER DENSITY

This easy to set up salt water density experiment is a cool variation of the classic sink or float experiment. What will happen to the egg in salt water? Will an egg float or sink in salty water? There are so many questions to ask and predictions to make with this easy physics experiment for kids.

SCREAMING BALLOON

This screaming balloon experiment is an awesome   physics activity for kids of all ages! Explore centripetal force or how objects travel a circular path.

SHADOW PUPPETS

Kids love their shadows, love to chase shadows, and love to make shadows do silly things! There’s also some fun things to learn about shadows for physics. Make simple animal shadow puppets and learn about the science of shadows.

SIMPLE PULLEY EXPERIMENT

Kids love pulleys and our homemade pulley system is sure to be a permanent fixture in your backyard this season. Make a pulley simple machine, learn a little physics, and find new ways to play.

We also have this simple pulley system you can make with a paper cup and thread.

SINK OR FLOAT

Use items straight out of the kitchen for our sink or float experiment. Plus I am sure your child will be able to come with other fun things to test! This is a simple physics experiment and totally engaging for young kids.

SNOWBALL LAUNCHER

Explore Newton’s Laws of Motion with this easy-to-make indoor snowball launcher. All you need are a few simple supplies for hands-on fun!

SOUND EXPERIMENT

Kids love to make noises and sounds is all a part of the physical sciences. This homemade xylophone sound experiment is truly a simple physics experiment for kids. So easy to set up, it’s kitchen science at it’s finest with plenty of room to explore and play!

SOAP POWERED BOAT EXPERIMENT

Explore surface tension as kids observe firsthand how soap influences the movement of a small boat on the water’s surface.

SPECTROSCOPE

Create your own DIY spectroscope from a few simple supplies and make a rainbow from visible light for a fun physics project for kids.

STATIC ELECTRICITY

Balloons are a must for this one! These simple experiments explore the concept of static electricity in a hands-on way.

TOY CAR FRICTION EXPERIMENT

Kids love to send cars down ramps! The faster the better! But did you know that this favorite playtime activity is also an awesome science lesson for kids of all ages. Explore friction with just a few simple materials.

VISCOSITY EXPERIMENT

Test the viscosity or “thickness” of different household liquids with this easy physics experiment for kids.

WATER DISPLACEMENT

Learn about water displacement and what it measures with this simple physics experiment for kids.

WATER REFRACTION

Why does the image appear reversed? Have fun with a hands-on demonstration of what happens when light bends! Plus, grab a free printable!

VALENTINE PHYSICS EXPERIMENTS

5 simple physics experiments with a Valentine’s Day theme, including a balloon rocket, static electricity, buoyancy, and more!

WIND POWERED CAR

Build a wind-powered car and explore how wind energy can be transformed into motion.

Add The Scientific Method To Any Physics Project

How To Use The Scientific Method

Encourage kids to make predictions, discuss observations, and re-test their ideas if they don’t get the desired results the first time.

Grab a free printable and learn more about variables and using the scientific method with kids here .

Helpful Science Resources To Get You Started

Here are a few resources that will help you introduce science more effectively to your kiddos or students and feel confident yourself when presenting materials. You’ll find helpful free printables throughout.

• Best Science Practices (as it relates to the scientific method)
• Science Vocabulary
• All About Scientists
• Free Science Worksheets
• DIY Science Kits
• Science Tools for Kids
• Scientific Method for Kids
• Citizen Science Guide
• Join us in the Club

Printable Science Projects Pack

If you’re looking to grab all of our printable science projects in one convenient place plus exclusive worksheets and bonuses like a STEAM Project pack, our Science Project Pack is what you need! Over 300+ Pages!

• 90+ classic science activities  with journal pages, supply lists, set up and process, and science information.  NEW! Activity-specific observation pages!
• Best science practices posters  and our original science method process folders for extra alternatives!
• Be a Collector activities pack  introduces kids to the world of making collections through the eyes of a scientist. What will they collect first?
• Know the Words Science vocabulary pack  includes flashcards, crosswords, and word searches that illuminate keywords in the experiments!
• My science journal writing prompts  explore what it means to be a scientist!!
• Bonus STEAM Project Pack:  Art meets science with doable projects!
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Wow, I see so many ideas here I want to try? Gravity art, nuts and bolts sculptures…my daughter is going to love these!

Great list of activities! I know that even as an engineer, physics “sounds” hard. Anything we can do to get kids trying it, playing with it and learning it helps remove that stigma. Thanks for including our slime, too 🙂

Your welcome! Yes Physics does sound intimidating but it doesn’t have to be.

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20 Awesome Science Experiments You Can Do Right Now At Home

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We can all agree that science is awesome. And you can bring that awesomeness into your very own home with these 20 safe DIY experiments you can do right now with ordinary household items.

1. Make Objects Seemingly Disappear Refraction is when light changes direction and speed as it passes from one object to another. Only visible objects reflect light. When two materials with similar reflective properties come into contact, light will pass through both materials at the same speed, rendering the other material invisible. Check out this video from BritLab  on how to turn glass invisible using vegetable oil and pyrex glass.

2. Freeze Water Instantly When purified water is cooled to just below freezing point, a quick nudge or an icecube placed in it is all it takes for the water to instantly freeze. You can finally have the power of Frozone from The Incredibles on a very small scale! Check out the video on this "cool" experiment. 

3. Create Oobleck And Make It Dance To The Music Named after a sticky substance in a children’s book by Dr Seuss , Oobleck is a non-Newtonian fluid, which means it can behave as both a solid and a liquid. And when placed on a sound source, the vibrations causes the mixture to gloopily dance. Check out these instructions from Housing A Forest  on how to make this groovy fluid funk out in every way.

4. Create Your Own Hybrid Rocket Engine With a combination of a solid fuel source and a liquid oxidizer, hybrid rocket engines can propel themselves. And on a small scale, you can create your own hybrid rocket engine, using pasta, mouthwash and yeast. Sadly, it won’t propel much, but who said rocket science ain’t easy? Check out this video from NightHawkInLight on how to make this mini engine.

5. Create "Magic Mud" Another non-Newtonian fluid here, this time from the humble potato. "Magic Mud" is actually starch found in potatoes. It’ll remain hard when handled but leave it alone and it turns into a liquid. Make your own “Magic Mud” with this video.

6. Command The Skies And Create A Cloud In A Bottle Not quite a storm in a teacup, but it is a cloud in a bottle. Clouds up in the sky are formed when water vapor cools and condenses into visible water droplets. Create your own cloud in a bottle using a few household items with these wikiHow instructions .

7. Create An Underwater Magical World First synthesized by Adolf van Baeyer in 1871, fluorescein is a non-toxic powder found in highlighter pens, and used by NASA to find shuttles that land in the sea. Create an underwater magical world with this video from NightHawkInLight .

9. Make Your Own Lava Lamp Inside a lava lamp are colored bubbles of wax suspended in a clear or colorless liquid, which changes density when warmed by a heating element at the base, allowing them to rise and fall hypnotically. Create your own lava lamp with these video instructions.

10. Create Magnetic Fluid A ferrofluid is a liquid that contains nanoscale particles of metal, which can become magnetized. And with oil, toner and a magnet , you can create your own ferrofluid and harness the power of magnetism! 

12. Make Waterproof Sand A hydrophobic substance is one that repels water. When sand is combined with a water-resistant chemical, it becomes hydrophobic. So when it comes into contact with water, the sand will remain dry and reusable. Make your own waterproof sand with this video .

13. Make Elephant's Toothpaste Elephant’s toothpaste is a steaming foamy substance created by the rapid decomposition of hydrogen peroxide, which sort of resembles giant-sized toothpaste. Make your own elephant’s toothpaste with these instructions.

14. Make Crystal Bubbles When the temperature falls below 0 o C (32 o F), it’s possible to freeze bubbles into crystals. No instructions needed here, just some bubble mix and chilly weather.

15. Make Moving Liquid Art Mixing dish soap and milk together causes the surface tension of the milk to break down. Throw in different food colorings and create this trippy chemical reaction.

16. Create Colourful Carnations Flowers absorb water through their stems, and if that water has food coloring in it, the flowers will also absorb that color. Create some wonderfully colored flowers with these wikiHow instructions .

17. "Magically" Turn Water Into Wine Turn water into wine with this  video  by experimenter Dave Hax . Because water has a higher density than wine, they can switch places. Amaze your friends with this fun science trick.

18. Release The Energy In Candy (Without Eating It) Dropping a gummy bear into a test tube with potassium chlorate releases the chemical energy inside in an intense chemical reaction. That’s exactly what's happening when you eat candy, kids.

19. Make Water "Mysteriously" Disappear Sodium polyacrylate is a super-absorbent polymer, capable of absorbing up to 300 times its own weight in water. Found in disposable diapers, you can make water disappear in seconds with this video .

20. Create A Rainbow In A Jar Different liquids have different masses and different densities. For example, oil is less dense than water and will float on top of its surface. By combining liquids of different densities and adding food coloring, you can make an entire rainbow in a jar with this video .

There you have it – 20 experiments for you to explore the incredible world of science!

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Science Projects > Science Fair Projects > Physics Science Fair Projects  

Physics Science Fair Projects

Physics is the basis for chemistry (the interaction of atoms and molecules). Most branches of engineering are applied physics. That’s why physics science fair projects make good impressions on judges.

– For tips on performing your experiment and presenting your project, see our free science fair guide.

– Browse our Science Fair Supplies category for more project ideas.

Electricity & Magnetism :

• Experiment with static electricity . How can you create it? How you can reduce it? What substances or objects are the best conductors of static electricity? Do conditions like humidity and temperature increase or decrease static electricity?
• Make electromagnets with different strengths; compare their magnetic fields using iron filings to find what effect they have on a compass needle and how strong their attraction is (e.g., which one can pick up the most paperclips?).
• Make a voltaic cell and research which household electrolytes are most effective for producing electricity. How well does a carbon rod instead of a metal rod work as a positive electrode?
• Can you use a magnet to find traces of iron in food, dollar bills, and other household materials?
• Make a crystal radio . What indoor and outdoor materials (such as metal poles, a window, etc.) make the best antennas for your radio? Under what conditions, such as temperature, cloud cover, and humidity, does your radio pick up the clearest signals?
• What types of liquid can conduct electricity ? Can electricity be used to split water into hydrogen and oxygen?
• Experiment with how magnetic and electric fields can make a magnet fall in slow motion . How could this principle be applied to real-world technology, like braking systems on roller coasters?
• Explore maglev technology (magnetic levitation).

Force & Motion :

• What are the best shapes for paper airplanes? The best material for propellers ?
• Experiment with thrust and aerodynamic design while launching a rocket .
• Design an experiment using a rocket car powered by a balloon.
• Create an experiment showing how well (or poorly) different structures or materials withstand pressure.
• How do different brands of plastic wrap compare when stretched with equal force? How do different brands of duct or clear tape compare in strength and stickiness? Can you identify what factors cause one to perform better than another?
• What type of flooring (carpet, wood, tile, linoleum, etc.) creates the most or the least friction? (Younger kids might test this by rolling a ball or toy truck over different surfaces. Older kids can use a spring scale to measure the force of friction. )
• Use toy cars or a dynamic cart to test what impact increased mass has on velocity. What are the resulting velocities after a moving and unmoving object collide? What about two moving objects in same or different directions?
• What type of pulley provides the highest mechanical advantage for a particular job?
• What types of metal conduct heat the fastest? Do some conduct heat more evenly than others? What types of materials are good insulators?
• Experiment with how much more energy is needed to catapult a heavier object the same distance as a lighter object. Create a similar experiment with a bow and arrow.
• Explore centripetal force by designing and building a mini roller coaster and demonstrating the physics behind it.
• How does the efficiency of an incandescent bulb compare to a fluorescent? What about LED? How much heat energy do they produce?
• Compare the effectiveness of different types of insulation. Which keeps out the most heat or cold?

Alternative Energy :

• How could you use a solar cell to recharge a battery? (You’ll need to use a diode and set up a circuit.) How does a solar cell compare to a battery with the same voltage?
•  How would you use solar energy most effectively in your home or school?
• What time of day tends to be best for charging a solar cell?
• How does the angle of incidence of light affect the energy output of a solar cell? Use a digital multimeter to measure how much voltage is being produced by the solar cell.
• What types of blades work best to produce electricity using a wind turbine ?
• Can you create an effective water turbine design? How would you connect it to a generator to produce electricity?
• Can you test/simulate the environmental effects of producing electricity from steam in geothermal areas?
• Can different substances (such as vinegar or salt) be used in electrolysis to make hydrogen production more cost-effective?
• Does increasing the number of electrodes make the process of electrolysis less time consuming or more cost effective?
• Can different alternative energy sources be used in combination to produce the energy to power a home?

Visit our science fair project ideas page for ideas in other categories, and check out our Physics Kits for High School for even more fun!

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4 Simple Experiments to Introduce Kids to Physics

It is never too early to start having fun with Physics!

This quick series of physics experiments is perfect for introducing little learners to concepts of push and pull! In the experiments that follow, kids will investigate how they can change the speed and direction of objects by applying varying degrees of strength. It’s a great way to get young students excited about physics and STEM in general.

Step 1: Introduce the Physics Experiments

First, connect motion to what the children already know. Ask them, “How do we move?” Have children raise their hands and demonstrate. Next, drop a stuffed animal on the ground. Ask students, “How can I make the stuffed animal move?” They will think about their past experiences with moving objects to derive an answer. Then, explain that a push and a pull are both forces. Force makes an object move or stop moving. When we push something, we are moving it away from us. When we pull something, we are moving it closer to us. (Act out motions with students: push = palms out, push away from body, and pull = two fists on top of each other, pull toward body.)

Brainstorm : Create a t-chart, write down objects that can be pushed or pulled (objects at home, in the classroom, on the playground).

Step 2: Do Small-Group Instruction  (Stations):

PHYSICS EXPERIMENT #1: SODA BOTTLE BOWLING

Push: Children experiment with pushing a ball hard and with less force to knock over soda bottles. They can compare a big push to a small push. What kind of push made the ball move the fastest? They will see how when objects collide (ball and soda bottle), they push on one another and can change motion. ADVERTISEMENT

PHYSICS EXPERIMENT #2: CHAIR PULLEY

PHYSICS EXPERIMENT #3: RAMPS AND MATCHBOX CARS

Push: Children create ramps using flat, rectangular wooden blocks and Duplo Lego bricks. They will investigate how the height of a ramp can change how fast and far their Matchbox car can go. They will also compare the distance and speed of the car on the ramp to using no ramp.

PHYSICS EXPERIMENT #4: SORTING PUSH AND PULL

Sort: Put out a paper bag that contains various real-world objects. Children collaborate and sort the objects using a Venn diagram (hula hoops). Children place the objects in the appropriate groups using this free printable”  push, pull or both .

Step 3: Reinforce the Concepts

After the physics experiments, children can play computer games to reinforce push and pull! I like these two:

• Push:  Piggy Push  from Cool Math Games
• Pull:  Hook the Fish  from Cookie

Or you can watch a  video  to reinforce pushes and pulls. For further reinforcement, the next day, have children go on a scavenger hunt and try to find things around the classroom that they can push and pull.

Step 4: Assessment

Children are assessed through observation, questions, and conversations while they work in small groups at stations, interacting with various objects that demonstrate pushing or pulling. I took notes and scored the children using a rubric  I made in iRubric. You can download it for free!

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by Chris Woodford . Last updated: January 6, 2023.

Photo: There are always new theories to test and experiments to try. Even when we've completely nailed how Earth works, there's still the rest of the Universe to explore! Fourier telescope experiment photo by courtesy of NASA .

1: Galileo demonstrates that objects fall at the same speed (1589)

Photo: Galileo proved that different things fall at the same speed.

2: Isaac Newton splits white light into colors (1672)

Artwork: A glass prism splits white light into a spectrum. Nature recreates Newton's famous experiment whenever you see a rainbow!

3: Henry Cavendish weighs the world (1798)

Artwork: Henry Cavendish's experiment seen from above. 1) Two small balls, connected by a stick, are suspended by a thread so they're free to rotate. 2) The balls are attracted by two much larger (more massive) balls, fixed in place. 3) A light beam shines from the side at a mirror (green), mounted so it moves with the small balls. The beam is reflected back onto a measuring scale. 4) As the two sets of balls attract, the mirror pivots, shifting the reflected beam along the scale, so allowing the movement to be measured.

4: Thomas Young proves light is a wave... or does he? (1803)

Artwork: Thomas Young's famous double-slit experiment proved that light behaved like a wave—at least, some of the time. Left: A laser (1) produces coherent (regular, in-step) light (2) that passes through a pair of slits (3) onto a screen (4). If Newton were completely correct, we'd expect to see a single bright area on the screen and darkness either side. What we actually see is shown on the right. Light appears to ripple out in waves from the two slits (5), producing a distinctive interference pattern of light and dark areas (6).

5: James Prescott Joule demonstrates the conservation of energy (1840)

Artwork: The "Mechanical Equivalent of Heat"—James Prescott Joule's famous experiment proving the law now known as the conservation of energy.

6: Hippolyte Fizeau measures the speed of light (1851)

Artwork: How Fizeau measured the speed of light.

7: Robert Millikan measures the charge on the electron (1909)

Artwork: How Millikan measured the charge on the electron. 1) Oil drops (yellow) are squirted into the experimental apparatus, which has a large positive plate (blue) on top and a large negative plate (red) beneath. 2) X rays (green) are fired in. 3) The X rays give the oil drops a negative electrical charge. 4) The negatively charged drops can be made to "float" in between the two plates so their weight (red) is exactly balanced by the upward electrical pull of the positive plate (blue). When these two forces are equal, we can easily calculate the charge on the drops, which is always a whole number multiple of the basic charge on the electron.

8: Ernest Rutherford (and associates) split the atom (1897–1932)

Artwork: Transmutation: When Rutherford fired alpha particles (helium nuclei) at nitrogen, he produced oxygen. As he later wrote: "We must conclude that the nitrogen atom is disintegrated under the intense forces developed in a close collision with a swift alpha particle, and that the hydrogen atom which is liberated formed a constituent part of the nitrogen nucleus." In other words, he had split one atom apart to make another one.

Artwork: In Rutherford's gold-foil experiment (also known as the Geiger-Marsden experiment), atoms in a sheet of gold foil (1) allow positively charged alpha particles to pass through them (2) as long as the particles are traveling clear of the nucleus. Any particles fired at the nucleus are deflected by its positive charge (3). Fired at exactly the right angle, they will bounce right back! While this experiment is not splitting any atoms, as such, it was a key part of the decades-long effort to understand what atoms are made of—and in that sense, it did help physicists to "split" (venture inside) the atom.

9: Enrico Fermi demonstrates the nuclear chain reaction (1942)

Artwork: The nuclear chain reaction that turns uranium-235 into uranium-236 with a huge release of energy.

10: Rosalind Franklin photographs DNA with X rays (1953)

Artwork: The double-helix structure of DNA. Photographed with X rays, these intertwined curves appear as an X shape. Studying the X pattern in one of Franklin's photos was an important clue that tipped off Crick and Watson about the double helix.

If you liked this article...

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• Six Easy Pieces by Richard Feynman. Basic Books, 2011. This book isn't half as "easy" as the title suggests, but it does contain interesting introductions to some of the topics covered here, including the conservation of energy, the double-slit experiment, and quantum theory.
• The Oxford Handbook of the History of Physics by Jed Z. Buchwald and Robert Fox (eds). Oxford University Press, 2013/2017. A collection of twenty nine scholarly essays charting the history of physics from Galileo's gravity to the age of silicon chips.
• Great Experiments in Physics: Firsthand Accounts from Galileo to Einstein Edited by Maurice Shamos. Dover, 1959/1987. This is one of my favorite science books, ever. It's a great compilation of some classic physics experiments (including four of those listed here—the experiments by Henry Cavendish, Thomas Young, James Joule, and Robert Millikan) written by the experimenters themselves. A rare opportunity to read firsthand accounts of first-rate science!

Text copyright © Chris Woodford 2012, 2023. All rights reserved. Full copyright notice and terms of use .

Top 10 Beautiful Physics Experiments

The list below shows the top 10 most frequently mentioned experiments by readers of  Physics World .

Top 10 beautiful experiments:

• Young's double-slit experiment applied to the interference of single electrons
• Galileo's experiment on falling bodies (1600s)
• Millikan's oil-drop experiment (1910s)
• Newton's decomposition of sunlight with a prism (1665-1666)
• Young's light-interference experiment (1801)
• Cavendish's torsion-bar experiment (1798)
• Eratosthenes' measurement of the Earth's circumference (3rd century BC)
• Galileo's experiments with rolling balls down inclined planes (1600s)
• Rutherford's discovery of the nucleus (1911)
• Foucault's pendulum (1851)

Others experiments that were cited included:

• Archimedes' experiment on hydrostatics
• Roemer's observations of the speed of light
• Joule's paddle-wheel heat experiments
• Reynolds's pipe flow experiment
• Mach & Salcher's acoustic shock wave
• Michelson-Morley measurement of the null effect of the ether
• Röntgen's detection of Maxwell's displacement current
• Oersted's discovery of electromagnetism
• The Braggs' X-ray diffraction of salt crystals
• Eddington's measurement of the bending of starlight
• Stern-Gerlach demonstration of space quantization
• Schrödinger's cat thought experiment
• Trinity test of nuclear chain reaction
• Wu et al.'s measurement of parity violation
• Goldhaber's study of neutrino helicity
• Feynman dipping an O-ring in water

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