Gravity in the solar system Quiz
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5 questions, one answer each
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1. A planet's distance from the Sun doubles. What happens to the Sun's gravitational force on it?
- A. It doubles
- B. It halves
- C. It becomes one quarter
- D. It stays the same
2. Which statement about orbital period is correct?
- A. Planets nearer the Sun have shorter orbital periods
- B. Planets nearer the Sun have longer orbital periods
- C. All planets have the same orbital period
- D. Orbital period depends only on a planet's colour
3. Why do astronauts on the ISS float?
- A. There is no gravity in space
- B. They are in free fall together with the station
- C. The station's engines push them upwards
- D. The air in the station pushes them upwards
4. What does gravity do to a satellite moving in a circular orbit?
- A. It speeds it up all the time
- B. It keeps changing the direction of its motion
- C. It slows it down until it stops
- D. It has no effect on it
5. Two satellites orbit the Earth. One is in a low orbit and one in a high orbit. Which statement is correct?
- A. The low one is slower
- B. Both move at the same speed
- C. The high one is faster
- D. The low one moves faster