A manufacturer tests a wall-mounted storage rack. Each test force bends the rack downwards.
The rack is suitable for repeated use only if its outer edge returns to its original position when the force is removed.
| Test force in N\mathrm{N}N | Position of outer edge before the force in m\mathrm{m}m | Position of outer edge after the force is removed in m\mathrm{m}m |
|---|---|---|
| 300 | 1.200 | 1.200 |
| 500 | 1.200 | 1.194 |
Calculate the permanent displacement of the outer edge after the 500 N force is removed and explain which of the tested forces should be the maximum working force for the rack.
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.