NEET Physics Work-Energy Theorem Assertion Reason Question
Assertion (A): The work-energy theorem implies that the work done by friction on a moving object is negative when the force opposes displacement.
Reason (R): For a force opposing displacement, the angle between force and displacement is 180 degrees, making the cosine of the angle negative.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
The NCERT context states that when the angle between force and displacement is 180 degrees (as in the case of friction opposing motion), the work done is negative because cos(180) = -1.
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