A locking mechanism contains a flexible strip. When operated, forces bend the strip. The strip must bend by at least 12 mm while the forces act and must return to its original shape after the forces are removed so that it can be used again.
Three materials are tested. Each strip is straight before testing.
| Material | Maximum deflection while forces act in mm | Deflection after forces are removed in mm |
|---|---|---|
| P | 10 | 0 |
| Q | 15 | 4 |
| R | 13 | 0 |
Evaluate which material should be used for the flexible strip.
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.