A student is investigating the relationship between the extension of a polymer thread of unstretched length 2.000 m2.000\text{ m}2.000 m and the load hung on the thread. She has a set of 5 N5\text{ N}5 N weights.
Consider the readings shown in Table 5.1:
| Column 1 | Column 2 | Column 3 |
|---|---|---|
| 000 | 2.0002.0002.000 | 0.0000.0000.000 |
| 555 | 2.0152.0152.015 | 0.0150.0150.015 |
| 101010 | 2.0302.0302.030 | 0.0300.0300.030 |
| 151515 | 2.0452.0452.045 | 0.0450.0450.045 |
| 202020 | 2.0602.0602.060 | 0.0600.0600.060 |
Table 5.1
Identify the appropriate column headings, including units, for Column 1, Column 2, and Column 3.
The student repeats the experiment using a thread made of a different material to study how the material affects extension. State two variables that must be kept constant to ensure a fair test.
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.