An investigation is carried out to study the relationship between the extension of a metal wire of unstretched length 2.000 m2.000\text{ m}2.000 m and the load hung on the wire. The student has a set of 15 N15\text{ N}15 N weights.
Consider the readings shown in the table:
| Column 1 | Column 2 | Column 3 |
|---|---|---|
| 0 | 2.000 | 0.000 |
| 15 | 2.002 | 0.002 |
| 30 | 2.004 | 0.004 |
| 45 | 2.006 | 0.006 |
| 60 | 2.015 | 0.015 |
State the appropriate column headings, including units, for:
The student decides to repeat the experiment using a wire made of a different metal in order to study how the material affects the extension. To ensure a fair comparison, suggest two other variables that the student must keep constant.
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.