NEET Physics Work Done by Forces MCQ Question
Which of the following combinations of statements about work done by forces is correct?
The work done by a man lifting a bucket is positive; the work done by gravity during this lift is negative.
Work done by friction is always positive regardless of the motion direction; work done by an applied force on a rough surface is negative.
Work done by an applied force on a body moving with uniform velocity is positive; work done by resistive air force is also positive.
The work done by gravitational force on a body moving upwards is positive; work done by friction is negative when moving down an incline.
Correct Answer
Detailed Explanation
According to NCERT, the work done by the man lifting the bucket is indeed positive, while the work done by gravitational force is negative as it acts in the opposite direction to the displacement.
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