In order for work to be done, what three things are necessary?

power, a force, and movement in the opposite direction of the applied force
balanced forces, motion, and distance covered over time
unbalanced force, motion in the same direction as the applied force, and power
unbalanced force, motion, and movement in the same direction of the applied force

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.