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.
Examples of zero work
When displacement operates in the forward direction.
The force acts in a downward direction,
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