Question

when is work done by force is negative​

Answer 1

Explanation:

A 'negative' force is one that is acting in the direction opposite to what you decide to be the positive direction (Usually, upward is +ve, downward is -ve). It means that the force is going to the opposite direction. ... If the object being acted upon is stationary, the sum of all the forces is zero.

Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.

Answer 2

Explanation:

work can be done either positive or negatively .

The force has the component in the same direction as the displacement of the object the force is doing positive work .

The force has a component in the direction opposite to the displacement , the force does negative work.