## Ω
uestions
1. When do we say that work is done?
2. Write an expression for the work done when a force is acting on an object in the direction of its displacement.
3. Define 1 J of work.
4. A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?