An engineer tests a spring intended for use in a bicycle brake lever. The engineer applies a force of 3.0 N to the spring four times and records the extension each time.
| Measurement | Extension in mm\mathrm{mm}mm |
|---|---|
| 1 | 18.7 |
| 2 | 28.1 |
| 3 | 18.6 |
| 4 | 18.8 |
Explain how the engineer should use these results to obtain a value of extension to plot for this force. Include the value in your answer.
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.