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This science fair project idea explores if the length of the string that an object is suspended on has an effect on how fast or slow it swings.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

In this Bernoulli's Principle experiment, you'll learn how an increase in the speed of a fluid, like air, decreases pressure.

Glass is see-through, but usually you can still see that it is there. In this experiment, we use baby oil to make glass go completely invisible.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

In this simple circular motion experiment, you'll observe tangential velocity and learn about how acceleration and centripetal force affect an object.

In this cool catalase and hydrogen peroxide experiment, kids put a potato in a jar of hydrogen peroxide to see how catalase acts as an enzyme.

Science fair project which evaluates different athletic shoes in order to find out whether any of them affect a person's ability to run.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

This science fair project idea explores which fruit molds the fastest.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

Kids get step-by-step instructions for how to make a rubber band car and explore the physics of potential energy with this fun engineering science fair project.

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Start your toy engines -- this is going to be a fast and friction-filled race!

This science fair project teaches students about wilting and browning of salad greens.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

This science fair project idea investigates how the shape of an object affects drag.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

This science fair project idea examines how well individuals can remember a story they were told and how accurately they pass that story along.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Using a toy race car kids create a visual model of the Doppler Effect.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.