A spring in a door closer is compressed when the door is opened. The table shows the length of the spring for two different compressing forces. The spring obeys Hooke's law throughout.
| Compressing force in N | Length of spring in cm |
|---|---|
| 0 | 18.0 |
| 24 | 15.0 |
Calculate the force needed to compress the spring to a length of 11.5 cm.
106 exam-style questions on AQA GCSE Physics 5.3 Forces and elasticity, covering 5.3 Forces and elasticity. Each one has a worked solution and a mark scheme showing where the marks go.