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# Newton's Laws of Motion Practice Questions (page 2)

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Updated on Sep 26, 2011

1. 5.98 · 1027 g
2. More, mass is a measure of inertia.
3. Less, 0.004 kg < 10 kg
4. No, speed will change.
5. Yes, the one put out by the engine.
6. No, it will decelerate (slow down) because the engine was overcoming friction. Without the engine, friction converts the energy of the car into heat.
7. No, the forces might cancel each other out.
8. No, because net force zero means that acceleration is zero, so there is no change in speed.
9. No, the object might be at rest.
10. No, because force is proportional to acceleration and acceleration is the change in velocity, not the velocity itself.
11. No, the larger the object, the smaller the acceleration: a = F/m.
12. 5 m/s2 and 10,000 N
13. (0.5; 4.9) N
14. 9.85 m/s2 and 4.9 N
15. α = 5.9° west of south
16. a1/a2 = 4/3
17. Yes, the net force is the result of all forces acting on the object, not only one.
18. Net force = –90 N and a = –450 m/s2
19. 0 Nand 0 m/s2
20. 10 cm/s2 = 0.1 m/s2 and F = 15 N
21. Action is the student's force of 25 N and acts on the strings. Reaction is the elastic force in the string that wants to return the string to its initial situation and that force is – 25 N and it's caused by the string on the student.
22. Yes, with an equal and opposite force.
23. No, because of friction acting differently on objects.
24. Yes, because there is only gravity and the acceleration of gravity is a constant.
25. No, mass does not influence the acceleration when friction is absent.
26. W= 25 N
27. 3:2 ratio also
28. 200 N. The system can be regarded as one single object with 20 kg mass.
29. See diagram.
30. 140 N
31. No, cases such as the inclined plane in problem 29 or the object in problem 30 show that the normal force is a result of action.
32. Tension and weight are the forces acting on the three objects.
33. Case (a) a = g/4
34. a = g/2
35. Yes, T = 17 N
36. a = 4.7 m/s2
37. 9.8 m/s2

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