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Work, Energy and Power
Question
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The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative,


(e) Work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

Answer

Negative Quantity.
The resistive force of air acts in the direction opposite to the direction of motion of the pendulum. Hence, negative work is done in this case.

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