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Question Question 2(v)
Define work. State the conditions when the work done by a force acting on a body is zero.
The definition of work states that when force is applied on a body and the body moves then work is said to be done.
The two conditions for the work done to be zero are,
(i) When there is no displacement of the body on application of force
i.e. S = 0 and
(ii) When displacement is normal to the direction of force
i.e. θ = 90° as cos 90° = 0