1. Newton’s Universal Law of Gravitation – Practice Problems
IB Physics Power Points
Topic 6 SL
Fields and Forces
Newton’s Universal Law of Gravitation – Practice Problems

2. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2.
A 50 kg student in an elevator accelerating downwards at 3 ms-2
A 50 kg student in an elevator falling freely

3. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest

4. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest

5. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
weight = 50 kg x 10 ms-2 = 500 N mg
500 N

6. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest Fg
500 N

7. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest W
500 N

8. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest FN
500 N mg
500 N

9. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.

10. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1. FN
500 N mg
500 N

11. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2. FN
500 N mg
500 N

12. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2. FN ? mg
500 N

13. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2.
500 N mg FN ?
Fnet ma
ma = 50 x 1 = 50 N

14. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2. FN
550 N mg
500 N

15. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2.
A 50 kg student in an elevator accelerating downwards at 3 ms-2 FN
350 N mg
500 N

16. 1. Draw free body diagrams (including annotations and calculated values) representing the following situations (consider g = 10 ms-2)
A 50 kg student in an elevator at rest
A 50 kg student in an elevator moving downwards at 2 ms-1.
A 50 kg student in an elevator moving upwards at 5 ms-1.
A 50 kg student in an elevator accelerating upwards at 1 ms-2.
A 50 kg student in an elevator accelerating downwards at 3 ms-2
A 50 kg student in an elevator falling freely mg
500 N

17. 2. Which of the following graphs shows how the gravitational force varies with the distance of separation between two objects?

18. What is the mass of this satellite? 23 kg 650 kg 910 kg 1 200 kg
3. A satellite experiences a gravitational force of 228 N at an altitude of 4.0 × 107 m above Earth.
What is the mass of this satellite?
23 kg
650 kg
910 kg
1 200 kg

19. 4. A rock drops from a very high altitude towards the surface of the moon. Which of the following is correct about the changes that occur in the rock’s mass and weight?