When force acts on a body and if position of the object __________ it is said work is done.

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Solution

Work done is expressed mathematically as $W = F d \cos θ$ i.e. scalar product of force and displacement.
Displacement is referred to as a change in the position of an object.
So when position changes by the application of a force, work is said to be done.
Hence, when force acts on a body and if position of the object changes it is said work is done.

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