An engineer tests two springs, R and S, for use in a retractable safety barrier. The force-extension relationship is linear for both springs during the test.
The spring constants of R and S are in the ratio 3:13:13:1. Each spring is stretched through the same distance from its natural length.
Four technicians give the following ratios for R compared with S.
| Technician | required stretching force R:S | stored energy R:S |
|---|---|---|
| A | 1:31:31:3 | 1:31:31:3 |
| B | 1:31:31:3 | 1:91:91:9 |
| C | 3:13:13:1 | 9:19:19:1 |
| D | 3:13:13:1 | 3:13:13:1 |
Which technician gives both ratios correctly?
Technician B
Technician D
Technician C
Technician A
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.