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A rough inclined plane is placed on a cart moving with a constant velocity u on horizontal ground. A block of mass M rests on the incline. Is any work done by force of friction between the block and incline? Is there then a dissipation of energy?

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No, Force of friction on body is due to the tendency of block M to slide down over inclined plane. No, as there is no work done so there no dissipation of energy.

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