Choose the incorrect statement

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no work is done by weight lifter holding a 175 kg mass steadily on his shoulder for 30 s.

work done by earth's gravitational force on moon is zero, considering moon's orbit to be circular

Work done by frictional force is always negative.

No work is done on moving a block uniformly on a smooth horizontal table.

answer is D.

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Detailed Solution

Option (a) Net force acting on block is zero.

Option (b) Force is perpendicular to displacement.

Option (c) Displacement of mass for those 30s is zero.

Option (d) Work done by friction may be positive.

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