This describes (with equations and diagrams) the work-energy principle, and how it applies to rotation, including the important conditions for rolling without slipping.
HyperPhysics
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Work and Simple Machines
StudyStack
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This website contains information and diagrams regarding the physical principles describing the motion of an Atwood machine. It also has a form in which you can plug in numbers and get results for tension.
gsu.edu Atwood machine
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An in-depth and extensive treatment of the subject of Work, with explanations, illustrations, diagrams, and examples.
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).
Physics Lab Online
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