Work is done when:

## The reasoning In physics, **work** has a very specific meaning. Work is only done when a force causes an object to move in the direction of that force. The formula is: **W = F × d × cos θ** where F is force, d is displacement, and θ is the angle between them. Key point: **Both force AND displacement must happen**. If you push a wall with all your strength but it doesn't move, you've done zero work (in physics terms) — no matter how tired you feel! The force must actually cause the object to shift position. ## Why the wrong options tempt you **A)** Seems right because you're exerting effort, but effort ≠ work. That immovable wall scenario proves it. **C)** Obvious trap — if it's at rest, nothing's moving. No displacement = no work. **D)** Gravity *acts* on you right now as you sit, but if you're not moving vertically, gravity does no work on you at that moment. ## Quick takeaway **"No movement, no work"** — both force and displacement must happen together for work to be done in physics.