Force and Laws of Motion

Grade 9 Science — Force and Laws of Motion: 25 practice questions with instant scoring and explanations.

1. Force is defined as:
2. Balanced forces are forces that:
3. Unbalanced forces:
4. Newton's first law of motion states that:
5. Inertia is:
6. An object with greater mass has:
7. Newton's second law of motion is expressed as:
8. If a 10 kg object experiences a net force of 20 N, its acceleration is:
9. Newton's third law of motion states that:
10. When you push on a wall, the wall pushes back with equal force. This demonstrates:
11. The SI unit of force is:
12. A 5 kg block is pushed with a force of 25 N. If friction is 5 N, the net force is:
13. If the net force on an object is zero, the object will:
14. A car moving at constant velocity on a straight road experiences:
15. Friction is a force that:
16. The normal force is:
17. A 100 N block sits on a surface. The normal force is:
18. Static friction is:
19. Kinetic friction is:
20. If the net force on a 2 kg object is 8 N, the acceleration is:
21. The weight of an object is:
22. A force of 100 N is applied at an angle to the horizontal. The effective horizontal component is 60 N. The force makes an angle of approximately:
23. When a book is placed on a table, the forces acting on it are:
24. A 6 kg object experiences forces: 30 N forward and 10 N backward. The net acceleration is:
25. In an elevator accelerating upward, the apparent weight of a person is: