In this fun science fair project idea learn the difference between additive and subtractive color and why they are handled differently.

Determine the maximum distance traveled by projectiles launched at an angle. Use some cool math to figure out at which angle your projectile will go farthest.

Science fair project which compares the rate of temperature change and the maximum temperature as a result of the angle of light radiation.

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

Measure the speed of the earth's rotation using protractors and meter sticks. This science fair project measures the angle of the sun in relation to earth.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

In this math and science activity, help your middleschooler learn about proportion and measurement with just her shadow and a tape measure!

Research different measurement systems, design your own new or improved system that can measure something difficult to measure with traditional systems.

Determine how different measurements of the same object might yield different values. Provide as many reasons that you can think of.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

This experiment will examine and precisely measure the amount of sugar in various sodas.

Science fair project which helps you determine your latitude by using an astrolabe, which measures the angle between the North Star and the horizon.

Science fair project that measure winds speed, temperature, and time of day in order to determine the origins of the wind.

Has your kid noticed how much bigger the moon looks when it's low in the sky? Here's an activity you can do to show them that it's just an optical illusion.

Kids learn how to manipulate additive and subtractive colors to send secret messages with red colored filters in this cool science fair project idea.

Become familiar with ratios and learn how to measure the diameter of the Sun and the Moon in this fun science fair project idea.

Check out this cool science fair project idea to explore various aspects of projectile motions like mass, angle and distance.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Measure the porosity of rocks by submerging them in water. Measure how much water each rock "drank," by measuring the difference in water volume.

Science fair project that examines learn how the angle of incidence affects the efficiency of solar panels. How does a solar cell work?

Show your fourth grader how to see her heart in action. Make a simple device out of a drinking straw and clay to help her spot the movement of her pulse!

This science fair project determines the quality of a given product.

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

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

In this science fair project, students make their own rain gauge to measure rainfall.

This is a fun and inexpensive project and it's a great way for your child to build basic geometry skills, like shape recognition and pattern/angle familiarity.

Measure the densities of various fruits and vegetables to determine if there is a relationship between density and nutritional value.

Look for a correlation between temperature and the intensity of cricket chirping. Measure ambient temperature and sound intensity in decibels.