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A body P is on a body Q and moving with ...

A body P is on a body Q and moving with it. Comment on the nature of work done by frinction on body P and on body Q at their contact surface

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Force of friction on body P is in the direction of displacement while force of friction on body Q is in a direction opposite to displcement

As forse of friction on body P is in the direction of displacement and force of friction on body Q is in a direction opposite to displacement, so work done by force of friction on body P is positive, while that on body Q is negative
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