Gravitational fields and Newton's law of gravitation Quiz
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5 questions, one answer each
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1. Distance from the centre of a planet is doubled. The field strength becomes:
- A. twice
- B. half
- C. one quarter
- D. one eighth
2. What are the units of gravitational potential?
- A. N kg⁻¹
- B. J kg⁻¹
- C. N m kg⁻¹
- D. J
3. A satellite is 3.0 × 10⁷ m above Earth's surface. Which is the correct value of r in g = GM/r²?
- A. 3.0 × 10⁷ m
- B. 3.0 × 10⁷ m plus the Earth's radius
- C. The Earth's radius
- D. 3.0 × 10⁷ m minus the Earth's radius
4. Which is a difference between gravitational and electric fields?
- A. Both follow an inverse square law
- B. Gravitational force is always attractive
- C. Both are radial for a point source
- D. Both have field strength as force per unit quantity
5. The gravitational potential at the Earth's surface is about −6.3 × 10⁷ J kg⁻¹. At infinity it is:
- A. −6.3 × 10⁷ J kg⁻¹
- B. zero
- C. +6.3 × 10⁷ J kg⁻¹
- D. infinite