In this question, a statement of assertion is followed by …

Physics Work, Energy, Power and Collision Assertion & Reason MCQ (Single Correct)

In this question, a statement of assertion is followed by a statement of reason . Mark the correct choice as:

Assertion: Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.
Reason: Work done by friction on a body sliding down an inclined plane is positive.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If assertion is false but reason is true.

Text Solution

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The correct answer is:

When a body slide down on an inclined plane, the angle between direction of motion, i.e.

displacement and frictional force is equal to Friction always acts in a direction opposite to the direction of the motion).
Hence,

i.e. work done by friction on a body sliding down an inclined plane is negative.

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