Question

State a situation in which force is applied ion a body but no work is done

Answer 1

Answer:

if a person is pushing a wall so in that case he is applying force but the wall is not moving. if work is done then there must be some displacement but in the case mentioned above the wall is not moving hence no work is done.

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Answer 2

Answer:

Explanation:

work done can be zero in two cases:

1) when there is no force applied (F=0)

2)when the displacement made by the body is 0 even if force is acting

3) when the force applied is perpendicular to the displacement of the body.

So,here in this question, the points (2) and (3) is to be considered(as point(1) is the case when no force  is applied)

So, the situation in which force is applied ion a body but no work is done:

2)when the displacement made by the body is 0 even if force is acting

(that is the body doesn't move even if force is applied .Ex: pushing a wall,the wall is not displaced on the application of force.)

3) when the force applied is perpendicular to the displacement of the body( the work done by tension in the string is zero when a stone is tied to one end of the string and rotated.)

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