A student hangs different weights on a spring and measures the extension each time.
Table
| Force (N) | Extension (cm) |
|---|---|
| 0 | 0 |
| 1.0 | 1.5 |
| 2.0 | 3.0 |
| 3.0 | 4.5 |
| 4.0 | 6.0 |
| 5.0 | 8.5 |
| 6.0 | 12.0 |
Which statement about the spring is correct?
It is linear up to 4.0 N4.0\ \text{N}4.0 N, and the spring constant is 67 N/m67\ \text{N/m}67 N/m
It is linear up to 5.0 N5.0\ \text{N}5.0 N, and the spring constant is 59 N/m59\ \text{N/m}59 N/m
It is linear up to 4.0 N4.0\ \text{N}4.0 N, and the spring constant is 0.67 N/m0.67\ \text{N/m}0.67 N/m
It is linear up to 6.0 N6.0\ \text{N}6.0 N, and the spring constant is 50 N/m50\ \text{N/m}50 N/m
46 exam-style questions on OCR GCSE Physics 2.3 Forces in action, covering 2.3.1 Stretching, bending and compressing, 2.3.2 Elastic and plastic deformation, 2.3.3 Force and extension of a spring, 2.3.4 Linear and non-linear force-extension behaviour, 2.3.5 The spring constant, 2.3.6 Work done in stretching, 2.3.7 Gravitational fields, 2.3.8 Weight and gravitational field strength, 2.3.9 Acceleration in free fall, 2.3.10 Relating force, mass and gravitational field strength, 2.3.11 Forces causing rotation, 2.3.12 The moment of a force, 2.3.13 Levers and gears, 2.3.14 Pressure in fluids, and 2.3.15 Pressure, force and contact area. Each one has a worked solution and a mark scheme showing where the marks go.