Assertion :Work done by friction on a body sliding down an inclined plane is negative Reason: Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion Work done by force →F causing a displacement →s is given as
W=→F.→s=Fscosθ
Thus the work done is positive for 0<θ<90∘
Hence the reason is correct.
Since the frictional force acting on a body sliding down acts in direction opposite to the direction of displacement of block, the work done is negative.