Four students are each given an identical spring and asked to determine its spring constant, kkk. They each apply an axial force to their spring and measure the resulting extension within the spring's limit of proportionality.
One student makes a mistake in their measurements.
The table below shows the results of the four students:
| Student | Force / N\text{N}N | Extension / m\text{m}m |
|---|---|---|
| A | 1.5 | 0.030 |
| B | 3.0 | 0.060 |
| C | 4.5 | 0.100 |
| D | 6.0 | 0.120 |
Which student made the mistake?
A
B
C
D
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.