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प्रश्न
Is the work done by friction on the stack of coins that travels on a rough surface positive, negative or zero?
लघु उत्तरीय
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उत्तर
Friction on the coin stack produces negative work.
The direction of motion (displacement) of the coins is opposite to the force of friction. The work caused by friction is negative because the force and displacement are going in opposite directions.
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