This website contains notes on mechanical advantage in pdf format.
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ohiostate.edu
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Brief explanations accompanied by photographs to illustrate simple machines.
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Boston Museum of Science Inventors Toolbox
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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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A nice simulation of a pendulum. It also graphs the motion for you.
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Oscillator
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An easy-to-read listing of the most important formulae relating to work, energy, and power.
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SparkNotes
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An in-depth and extensive treatment of the subject of Work, with explanations, illustrations, diagrams, and examples.
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SparkNotes
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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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