The goal of this science fair project is to attempt to build a perpetual motion machine and analyze the Laws of Thermodynamics.

Looking for a project on machines? Get a fun elementary school science fair project idea to design a compound machine using your knowledge of simple machines.

Learn the chemistry and physics of the brain, how our nervous system work. Demonstrate that the brain is an electrical and chemical machine.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

Learn about the Atwood Machine and Newton's 2nd Law with a pulley and masses of different weights in this physics science project.

Learn about this simple machine and make a pulley of your own to use for fun science trials.

Have your child build his own mini waterfall, and help him develop his planning, problem solving, and architectural skills.

Do you hate to waste energy? In this experiment, you will design a machine that is powered by the process known as energy transformation.

Design and build an invention inspired by Rube Goldberg's designs. Build your invention. Test the machine, write a detailed report.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

Design a livable building that functions without electricity. Consider necessities, comforts and entertainment. Build a scale model of your design.

Give your budding young observers a chance to discover simple machines at use in their own home.

Science fair project that determines whether mass and weight are the same or different.

In this design challenge, your child will use building bricks to create a funny face. The activity instructions include question prompts thta can help guide your child through the creative process, and promote their problem-solving skills.

This fun elementary school science fair project idea helps students in designing an amusement park using their knowledge of forces and simple machines.

The project examines absorbent polymers absorbency in disposable diapers and their unique ecological problem to the environment.

How sensitive is your skin? Here's a fourth grade science experiment that lets your child figure it out.

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

This kinesthetic learning activity will help your fourth grader get a firm grasp on the immensity of the solar system.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!

Put your second grade scientist to work this Fourth of July with our colorful "liquid fireworks" project!

Is the birthday paradox really a paradox, or just an intriguing problem that defies intuition? Find out with this birthday paradox science fair project.

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.

If your fourth grader is obsessed with all things glow-in-the-dark, then here's an activity that will really light up her imagination!

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

Here's a fourth grade science craft with lots of benefits: it's good for birds, good for your child's learning, and good for the planet, too.

Excite your fourth grader by recreating ancient Viking myths. This miniature longboat will explore the principle of water molecules expanding when heated.

Your fourth grader will be astonished to discover the significance and intricacies of his spine as he builds a model of a human vertebral column.

In this cool physics experiment, use double plane mirrors at various angles to learn about light reflection. Then, see if you can solve a puzzling problem!

Introduce your fourth grader to the concepts of solstices by observing the length of her shadow on the shortest day of the year, compared to other solstices.