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The speed at which sound travels from one place to another depends upon the medium and how closely packed the molecules are in the matter. Learn more about how sound travels from the simulation.
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A wave is energy in motion or energy moving from point to point. To describe the traits of a wave, there are a few terms you need to know. Choose a term in the activity to display its description in...
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The Sun is a natural source of visible light waves. Our eyes see the reflection of the sunlight off the objects around us. Check out the simulation to learn more about scattering light.
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In the activity, choose a color to find out why objects appear in a particular color.
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Thrust is the force that propels or drives an airplane forward. This force can be produced by an engine spinning a propeller or a jet engine expelling hot gas from the back. Watch the simulation.
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If you have ever put your hand outside the window of a moving car, you have experienced drag. Watch the simulation.
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An upward force called lift, acts on the airplane and opposes the downward forces of gravity. The lift force allows the airplane to get off the ground and stay in the air. Watch the simulation.
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What do thunderclouds and static charge have in common?
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If you want to understand electricity, you first need to know a little about matter, atoms and electrons.