Question

We cannot consider something to be work unless

Answer 1

When displacement caused by force is zero or force is perpendicular to displacement then we consider there will be no work done

Step-by-step explanation:

We know that work done is given by
`W=Fdcos\Theta`, here F is force applied and d is the displacement caused by the force

Now there are two case in which work done will be zero that is, either displacement is zero or
`\Theta =90^(\circ)` that is force and displacement are perpendicular to each other

So when displacement caused by force is zero or force is perpendicular to displacement then we consider there will be no work done

Answer 2

We cannot consider something to be work unless force applied causes movement of an object in the same direction as the applied force.