An autonomous drilling unit is tested on the Earth and is then used on the Moon and on Mars. A force sensor on the unit records its weight at each location. One reading has lost the label that shows where it was recorded.
The table gives the gravitational field strength at each location.
| Location | g g\,g in N/kg\text{N/kg}N/kg |
|---|---|
| Earth | 10 |
| Moon | 1.6 |
| Mars | 3.7 |
The drilling unit has a mass of 125 kg. The unlabelled reading is 200 N.
Determine where the unlabelled reading was recorded.
80 exam-style questions on Edexcel GCSE Physics 7.1 The Solar System and gravity, covering 7.1.1 Weight and g on different bodies in space, 7.1.2 The Solar System, 7.1.3 Changing ideas about the Solar System, 7.1.4 Orbits of moons, planets, comets and satellites, and 7.1.5 Gravity and orbital motion. Each one has a worked solution and a mark scheme showing where the marks go.