D.1 Gravitational fields Quiz
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5 questions, one answer each
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1. The distance between two point masses is tripled. The gravitational force between them becomes:
- A. one third
- B. one sixth
- C. one ninth
- D. one twenty-seventh
2. Planet B orbits the same star as planet A at four times the orbital radius. Its period is:
- A. 2 times longer
- B. 4 times longer
- C. 8 times longer
- D. 16 times longer
3. Which statement about g at a point is correct?
- A. It is the force on any mass there
- B. It is the force per unit mass on a small test mass there
- C. It is always 9.81 N kg⁻¹
- D. It is a scalar
4. Gravitational field lines close to Earth's surface over a small region are:
- A. Circles around Earth
- B. Parallel and equally spaced
- C. Pointing away from Earth
- D. Crossing each other
5. A comet is moving slowest when it is:
- A. At perihelion
- B. At aphelion
- C. Crossing Earth's orbit
- D. At the same speed everywhere