Equations, description and diagrams of gravitation. Includes satellite motion.
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Spark Notes
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Covers basics of universal gravitation and application to motion of satellites. Includes example problems.
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PhysicsLAB
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This page has a few links to different lessons about gravity. This specific page talks about the history of gravity and the apple, it also provides some equations and explanations that relate to the inverse law.
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Physics Classroom
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This site gives a detailed explanation with equations needed to better understand Universal Gravitation.
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The Open Door
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This site provides a neat, concise, and lucid explanation of how to solve problems having to do with pulleys. It extends the simple explanation to include inertia; and, by extension, friction as well. Just substitute friction for inertia (Ia).
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Physics Lab Online
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Projectile motion on Earth: Java applet animation.
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University of Saskatchewan Physics
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