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Physics-Work-Energy Theorem

NEET Physics Work-Energy Theorem Assertion Reason Question

Type: Assertion Reason-assertion-Medium-Class 11

Assertion (A): The work done by friction is always negative.

Reason (R): The angle between frictional force and displacement is 180 degrees.

A

Both A and R are true, and R is the correct explanation of A.

B

Both A and R are true, but R is not the correct explanation of A.

C

A is true but R is false.

D

A is false.

Correct Answer

Option A

Detailed Explanation

According to the NCERT context, the frictional force opposes displacement, making the angle 180 degrees, resulting in negative work (cos 180° = -1).

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