State whether the work done in the following cases is positive or negative.
Work done by friction on a body sliding down an inclined plane.

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Solution

If force and displacement work in the same direction then the work carried out on the object is positive, and if they are in opposite direction then the work carried out on the object is positive is negative.
When a body slides down, the force of friction acts in the opposite direction, resisting the motion of the sliding body.
The force of friction and displacement are in opposite directions.
Hence, the work done is negative.

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