Two identical silicone sealing strips, C and D, are each 250 mm long before testing. Different forces are used to stretch the strips. All the forces are then removed.
| Strip | Shape of the force–extension graph while the strip is stretched | Length once the forces are removed in mm\mathrm{mm}mm |
|---|---|---|
| C | Curve starting at the origin | 257 |
| D | Curve starting at the origin | 250 |
What do these results show about the two strips?
C shows non-linear elastic behaviour; D shows non-linear inelastic behaviour.
C shows non-linear inelastic behaviour; D shows non-linear elastic behaviour.
C shows directly proportional inelastic behaviour; D shows non-linear elastic behaviour.
C and D both show non-linear inelastic 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.