When work is done, energy is transferred from one object or system to another.

Quick Scoop

  • In physics, work is defined as a force causing an object to move in the direction of the force.
  • Whenever this happens, energy moves from the agent doing the work (like a person, engine, or battery) to the object being moved or affected.
  • Because of this, “work done” and “energy transferred” are treated as equivalent and are both measured in joules.

A tiny story to picture it

Imagine pushing a box across the floor. Your muscles use chemical energy, and as you push:

  • The box speeds up, gaining kinetic energy.
  • Some energy is also “lost” as heat and sound due to friction.

All of that energy flow from you to the box and surroundings happens because you did work on the box.

In short: when work is done, energy is what’s transferred.