Two resistance cords, R and S, are each 1.20 m long before testing. Each cord is stretched and then all the forces are removed.
| Cord | Shape of the force–extension graph while the cord is stretched | Length once the forces are removed in m\mathrm{m}m |
|---|---|---|
| R | Curve starting at the origin | 1.20 |
| S | Straight line through the origin | 1.20 |
What do these results show about the two cords?
R shows non-linear elastic behaviour; S shows directly proportional elastic behaviour.
Both R and S show directly proportional elastic behaviour.
R shows non-linear elastic behaviour; S shows directly proportional inelastic behaviour.
R shows non-linear inelastic behaviour; S shows directly proportional elastic behaviour.
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.