Question

When can you say that the work done is either positive, negative or zero?

Answer 1

• When the force and the displacement are in the same direction, the work done by the force is positive.
• When the force and displacement are in the opposite directions, the work done by the force is negative. 
• When the applied force does not cause any displacement or when the force and the displacement are perpendicular to each other, the work done by the force is zero.