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.
Practise OCR GCSE Physics Forces in action with exam-style questions for Foundation and Higher tier. 100 questions, matched to the OCR GCSE Physics (J249) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.