A gate mechanism uses a stretchable cord. Opening the gate stretches the cord.
The force-extension relationship of the cord is a straight line through the origin up to the fully open position.
For the mechanism to work correctly, the cord must:
| Measurement | Value |
|---|---|
| Length before the gate is opened | 0.40 m |
| Length when the gate is fully open | 0.55 m |
| Force when the gate is fully open | 12 N |
| Length after the stretching forces are removed | 0.40 m |
Calculate the energy stored by the cord when the gate is fully open.
Explain whether the cord is suitable for this gate mechanism.
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.