Different celestial bodies have different gravitational field strengths at their surface.
| Celestial body | Gravitational field strength (N/kg\text{N/kg}N/kg) |
|---|---|
| Jupiter | 252525 |
| Neptune | 111111 |
| Moon | 1.61.61.6 |
On which body's surface would a robotic lander have the least weight? Explain your answer.
Which property of a planet or moon primarily affects its gravitational field strength at the surface?
On Earth, the robotic lander has a weight of 1500 N1500 \text{ N}1500 N. Its landing pads have a total area of 0.3 m20.3 \text{ m}^20.3 m2 in contact with the ground.
Calculate the pressure the lander exerts on the ground.
The lander is stationary on the ground. Describe the two vertical forces acting on the lander. In your answer, state their names, directions, and how their relative magnitudes compare.
39 exam-style questions on OCR GCSE Physics Forces in action. Each one has a worked solution and a mark scheme showing where the marks go.