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Question
Assertion (A): Work done by frictional force is negative.
Reason (R): This is because frictional force acts along the direction of motion.
Options
Both A and R are true and R is the correct explanation of A.
Both A and R are true and R is not the correct explanation of A.
Assertion is false but reason is true.
Assertion is true but reason is false.
MCQ
Assertion and Reasoning
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Solution
Assertion is true but reason is false.
Explanation:
Friction opposes relative motion, so it acts opposite to the displacement; hence work done by friction is negative, making the assertion true. But the reason says friction acts along the direction of motion, which is false. Therefore assertion is true and reason is false.
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Chapter 2: Work, Energy and Power - EXERCISE - 2(A) [Page 31]
