# 5.1.1 Work & Energy

### Work Done

• In Physics, work is done when an object is moved over a distance by an external force applied in the direction of its displacement • In the diagram below, the man’s pushing force on the block is doing work as it is transferring energy to the block (increasing its kinetic energy) Work is done when a force is used to move an object over a distance

• When work is done, energy is transferred from one object to another
• Work done can be thought of as the amount of energy transferred, hence its units are in Joules (J)
• Usually, if a force acts in the direction that an object is moving then the object will gain energy
• If the force acts in the opposite direction to the movement then the object will lose energy

#### Exam Tip

A common exam mistake is choosing the incorrect force which is not parallel to the direction of movement of an object. You may have to resolve the force vector to find the component that is parallel. The force does not have to be in the same direction as the movement, as shown in the worked example. ### Author: Ashika

Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.
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