Which of the following is not an example of zero work? (1) The work done by the tension in the string, when a body tied with the string move along a circular path (2) When a horse pulls a cart on a level road. (3) The work done by a coolie when he travels on a horizontal platform, with a load on his head. (4)When a person holds some amount of load but, does not move from his position.

Answer: (2) When a horse pulls a cart on a level road

Zero work

Zero work is defined when force and displacement are perpendicular to one another and when force or displacement is zero.

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