Gravitational field strength Quiz
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5 questions, one answer each
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1. A planet has surface field strength g. At a distance of 2R from its centre (R is its radius) the field strength is
- A. g/2
- B. g/4
- C. 2g
- D. g/8
2. Which equation correctly gives the field strength at distance r from a point mass M?
- A. g = GM/r
- B. g = GM/r²
- C. g = Gm/r²
- D. g = GMm/r²
3. Gravitational field lines near the Earth's surface over a small region are best described as
- A. parallel and equally spaced
- B. radial and diverging
- C. circular
- D. closer together with height
4. A planet has the same mass as the Earth but twice the radius. What is its surface field strength compared with the Earth's?
- A. Twice as large
- B. The same
- C. Half as large
- D. One quarter as large
5. The unit of gravitational field strength can be written as
- A. N kg⁻¹
- B. N kg
- C. kg m s⁻²
- D. J kg