# 1.7.5 Work

### Work Done

• Energy is the capacity of something to do work
• Work is done whenever a force acts on an object that moves (or is moving) in the direction of the force
• The greater the force, the greater the work
• The larger the distance moved, the larger the work

Work is done when a force is used to move an object a distance

• Whenever any work is done, energy gets transferred (mechanically) from one form to another
• The amount of energy transferred (in joules) is equal to the work done (also in joules)
`energy transferred (J) = work done (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

Extended Only

### Calculating Work Done

• The amount of work that is done if related to the size of the force and the distance moved by the object in the direction of the force:
`work done  =  force × distance moved`

`W = F× d`
• You can rearrange this equation with the help of the formula triangle:

• The units of work are joules (J) (the same as the units of energy), but can also be given as newton metres (Nm)

### Author: Jenna

Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.
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