Work, Energy and Power MCQ question and answer with solution | Physics Gk MCQs

Work is done when a force causes an object to move a certain distance in the direction of the force.

Let's look at the options:

A) Force: Just having a force isn't enough. Think of pushing a heavy wall. You're applying force, but the wall doesn't move, so no work is done.

B) Energy: Energy is the ability to do work. It's related to work, but not the same thing. You need energy to do work, but energy itself isn't work.

C) Friction: Friction is a force that opposes motion. Friction can cause work to be done (e.g., rubbing your hands together creates heat, which is a form of energy). But friction isn't work itself. Work is done *by* or *against* the frictional force.

D) Power: Power is the rate at which work is done. It tells you how quickly work is being done, not if work is being done at all.

Therefore, work is only present if there is a force and the object moves in the direction of that force.