A tension spring is used in a conveyor-belt mechanism. The table gives the length of the spring for two different forces.
| Force in N\mathrm{N}N | Length in cm\mathrm{cm}cm |
|---|---|
| 4.0 | 17.0 |
| 10.0 | 20.0 |
The spring remains below its limit of proportionality for all the forces used.
Calculate the length of the spring when the force is 14.0 N.
102 exam-style questions on Edexcel GCSE Physics 15.1 Forces and springs, covering 15.1.1 Elastic and inelastic distortion, 15.1.2 The spring constant, 15.1.3 Work done in stretching a spring, and 15.1.4 Linear and non-linear force–extension. Each one has a worked solution and a mark scheme showing where the marks go.