Gravitational fields and Newton's law of gravitation Quiz
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5 questions, one answer each
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1. What is the unit of gravitational field strength?
- A. kg m s⁻²
- B. N kg⁻¹
- C. N m² kg⁻²
- D. J kg⁻¹
2. The distance between two point masses is halved. What happens to the gravitational force between them?
- A. It halves
- B. It doubles
- C. It increases by a factor of 4
- D. It decreases by a factor of 4
3. A planet has mass M and radius R. What is the field strength at a height R above its surface?
- A. GM/R²
- B. GM/(2R²)
- C. GM/(4R²)
- D. 2GM/R²
4. Which statement about g = GM/r² is correct?
- A. g depends on the mass of the object placed in the field
- B. g is the same at all points around a planet
- C. g depends on the mass of the source and the distance from its centre only
- D. g increases with distance from the source
5. Planet X has twice the mass and twice the radius of planet Y. The surface field strength of Y is g. What is it on X?
- A. g/2
- B. g
- C. 2g
- D. 4g