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When can we say that work is not done?

Updated: 8/21/2019
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6y ago

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In the simplest case (direction doesn't change, force is constant), work is defined as:work = force x distance x cos(angle)

No work is done when any of these factors is zero.

In more complicated cases, an integral must be used for the calculation. In this case, it is possible that for part of the path, positive work is done, for another part, negative work, in which the total work MIGHT just happen to be zero.

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Q: When can we say that work is not done?
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