NEET Physics (general) MCQ Question
Which of the following combinations of statements regarding work done by forces is correct?
a) Work done by a man lifting a bucket is positive; b) Work done by gravitational force is negative; c) Work done by friction while sliding down is positive.
a) Work done by a man lifting a bucket is positive; b) Work done by gravitational force is positive; c) Work done by friction while sliding down is negative.
a) Work done by a man lifting a bucket is negative; b) Work done by gravitational force is negative; c) Work done by friction while sliding down is negative.
a) Work done by a man lifting a bucket is positive; b) Work done by gravitational force is negative; c) Work done by friction while sliding down is negative.
Correct Answer
Detailed Explanation
The work done by a man lifting a bucket is positive as he is exerting force in the direction of displacement. The work done by gravitational force is negative because it acts opposite to the direction of the lifting force. The work done by friction is negative as it opposes motion.
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