Question

When do we say that work is done write an expression for the work done when force and acting on a object not in the direction of its displacement and define 1 joule of work?

Answer 1

In this case work done negative

Let example if a heavy mass is moving down from hill or mountain and you apply the force but it still moving down then workdone is negative and we can say same expression of positive work is used as in negative only - sign is applied

Answer 2

Answer:

Force in the Direction of Displacement ... No work is done if the object does not move. ... When a force acts on an object over a distance , it is said to have done work on the object.