A student hangs a length of steel wire from a support, adds weights to the lower end, and measures the extension of the wire.
Here is a table of some of her results:
| Weight (N) | Extension (m) |
|---|---|
| 0 | 0.00 |
| 5 | 0.01 |
| 10 | 0.02 |
| 15 | 0.03 |
| 20 | 0.06 |
| 25 | 0.12 |
Describe the relationship between force and extension for weights from 000 to 15 N15\text{ N}15 N.
Describe and explain what happens to the wire's behavior when the weight exceeds 15 N15\text{ N}15 N.
Calculate the spring constant (stiffness) of the wire for the 000 to 15 N15\text{ N}15 N portion of the results.
Use the equation: Force=Spring constant×Extension\text{Force} = \text{Spring constant} \times \text{Extension}Force=Spring constant×Extension
Calculate the work done in stretching the wire to 0.03 m0.03\text{ m}0.03 m.
39 exam-style questions on OCR GCSE Physics Forces in action. Each one has a worked solution and a mark scheme showing where the marks go.