Answer:
unbalanced force, motion, and movement in the same direction of the applied force
Explanation:
Work Done is actually the product of force and distance. If force is applied without covering a distance in the direction of the force then work is zero
Force, we know, is that we tend to change a body's state of rest or uniform motion on a straight line. Force is also the pull or push on an object
so In order for work to be done, what three things are necessary?
unbalanced force, motion, and movement in the same direction of the applied force
if there is a balanced force applied on the body , motion won't occur .In Fact the body will be at equilibrium which means zero work.