Question

Work is always done when
(1) an object moves.
(2) a force moves an object.
(3) a force is exerted on an object.
(4) an object has mass

Answer 1

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Answer 2

answer : option (2)

workdone is the dot product of force applied on object and displacement of that object.

if $\vec{F}$ is force applied on object, $\vec{S}$ displacement of object.

then, workdone due to object , W = $\vec{F}.\vec{S}$

or, W = $|F||S|cos\theta$

where $\theta$ is angle between force and displacement of object.

here you should notice that work is always done only when force moves the body.

hence, from above explanation it is clear that workdone is always done when force moves an object.

[ remember : work can't be done when displacement is perpendicular direction of force applied. as theta = 90° then, workdone = 0]