Hundreds of free games illustrating basic principles of physics.
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PhysicsGames.net
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In this video, Salman Khan of Khan Academy introduces the basic concepts of motion. Part 2 of 3.
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Khan Academy
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Description, equations and diagrams of collisions. Uses momentum and kinetic energy.
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Spark Notes
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Need to study for Physics? Here are some questions to help you out!!!
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StudyStack
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This site has more of an explanation approach to each topic and while it may not cover as much "advanced" material, such as magnetism, electricity and related principles), it is a very good resource for mechanics and classic first semester college/high school concepts
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The Physics Classoom
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This website provides not only an explanation of how the ballistic pendulum can be used to measure the speed of a bullet but also a calculator to check your work. It can be used to explain a similar assembly involving a spring instead of a pendulum as well. You simply substitute the equation for the potential energy of a spring for (M+m)gd -- the potential energy of the pendulum.
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Hyperphysics
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Diagrams, equations and description of impulse and momentum.
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Spark Notes
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In this video, Salman Khan of Khan Academy introduces the basic concepts of motion. Part 1 of 3.
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Khan Academy
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Visually shows collisions of different masses and the same masses.
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Fear Of Physics
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