Gravitation

Grade 9 Science — Gravitation: 25 practice questions with instant scoring and explanations.

1. Newton's universal law of gravitation states:
2. The gravitational force between two objects increases when:
3. If the distance between two objects is doubled, the gravitational force becomes:
4. Acceleration due to gravity (g) on Earth's surface is approximately:
5. The weight of an object is:
6. A 50 kg person on Earth experiences a gravitational force (weight) of: (g = 10 m/s²)
7. Free fall occurs when:
8. An object dropped from rest falls for 3 seconds. The distance it falls is: (g = 10 m/s²)
9. The acceleration of gravity on the Moon is about 1/6 that of Earth. A person weighing 600 N on Earth would weigh approximately:
10. Mass and weight are different because:
11. An astronaut has a mass of 80 kg. On Earth (g = 10 m/s²), their weight is:
12. Kepler's first law states that planets orbit the Sun in:
13. Kepler's second law (law of equal areas) states that:
14. Kepler's third law relates:
15. The gravitational force is:
16. An object thrown upward with initial velocity 20 m/s reaches maximum height at: (g = 10 m/s²)
17. The gravitational constant G is:
18. If an object is at height h above the ground, its gravitational potential energy is: (relative to ground)
19. The gravitational potential energy of a 10 kg object at a height of 5 m is: (g = 10 m/s²)
20. Escape velocity from Earth is the velocity needed to:
21. A projectile launched horizontally from a height has:
22. The range of a projectile depends on:
23. The time of flight for a projectile launched horizontally from height h is independent of:
24. An object in orbit experiences:
25. Gravitational force between two objects is::