Try this interactive problem dealing with Newton's Law
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Interactive Physics
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This gives the definition, an equation, and a graphical interpretation.
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IUN/FYDE Introductory Physics Notes
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Interactive Java applets that can be downloaded or run from the website. Graphics are excellent. Covers several less common topics, e.g. in heat and thermodynamics.
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Physics Education Technology Project
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This site has tutorials on various trajectory problems. It includes interactive trajectory calculators.
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Trajectories
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This is an excellent applet and calculator showing how projectiles can be fired into orbit, or not, depending upon initial velocity.
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Fowler's Applets
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This is a very nice applet and calculator that illustrates and allows the calculation of trajectories of projectiles fire with different velocities and at different angles.
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Fowler's Applets
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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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