The table shows the extension of a spring as the force increases.
| Force in N\mathrm{N}N | Extension in mm\mathrm{mm}mm |
|---|---|
| 0 | 0 |
| 1.0 | 4 |
| 2.0 | 8 |
| 3.0 | 12 |
| 4.0 | 19 |
Which conclusion is supported by these results?
Proportionality is shown up to 4.0 N4.0\ \mathrm{N}4.0 N; loading data alone prove permanent distortion.
Proportionality is shown up to 4.0 N4.0\ \mathrm{N}4.0 N; unloading data are needed to test permanent distortion.
Proportionality is shown up to 3.0 N3.0\ \mathrm{N}3.0 N; loading data alone prove permanent distortion.
Proportionality is shown up to 3.0 N3.0\ \mathrm{N}3.0 N; unloading data are needed to test permanent distortion.
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.