Which of the following is NOT an example

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Target Exam

CUET

Subject

Physics

Chapter

Work Power Energy

Question:

Which of the following is NOT an example of zero work ?

Options:

The work done by the tension in the string, when a body tied with the string moves along a circular path

The work done when a horse pulls a cart on a level road

The work done by a coolie when he travels on a horizontal platform, with a load on his head

The work done when a person holds some amount of load but, does not move from his position

Correct Answer:

The work done when a horse pulls a cart on a level road

Explanation:

In circular motion, the net displacement is zero. So the work done is zero too. Thus, \(W = zero\)
The force is in forward direction and so is the displacement. Thus, \(W \neq zero\)
The work is done against the gravitational force which acts downwards. The displacement is forward in direction. Thus, \(W = zero\)
The force is in action but there is NO displacement. Thus, \(W = zero\)