1. Force
Test REVIEW

2. In the absence of an external force, a moving object will
A. Slow down to a stop
B. Go faster and faster
C. Stop immediately
D. Move with constant speed

3. In the absence of an external force, a moving object will
A. Slow down to a stop
B. Go faster and faster
C. Stop immediately
D. Move with constant speed

4. A. Instantaneously equal to zero
An object is thrown straight up. At the top of its path the net force acting on it is
A. Instantaneously equal to zero
B. Greater than zero but less than its weight
C. Equal to its weight
D. Greater than its weight

5. A. Instantaneously equal to zero
An object is thrown straight up. At the top of its path the net force acting on it is
A. Instantaneously equal to zero
B. Greater than zero but less than its weight
C. Equal to its weight
D. Greater than its weight

6. A camera has a mass of 40 kg on the moon. gmoon = –1. 6 m/s2
A camera has a mass of 40 kg on the moon. gmoon = –1.6 m/s2. The weight of the camera on earth is about
A. 7 N
B. 40 N
C. 65 N
D. 240 N
E. 400 N

7. A camera has a mass of 40 kg on the moon. gmoon = –1. 6 m/s2
A camera has a mass of 40 kg on the moon. gmoon = –1.6 m/s2. The weight of the camera on earth is about
A. 7 N
B. 40 N
C. 65 N
D. 240 N
E. 400 N

8. A 15-kg wagon is pulled to the right with a force of 45 N
A 15-kg wagon is pulled to the right with a force of 45 N. The wagon accelerates to the right at 2 m/s2. How large is the friction force?
A. 3 N
B. 15 N
C. 30 N
D. 45 N
E. 60 N

9. A 15-kg wagon is pulled to the right with a force of 45 N
A 15-kg wagon is pulled to the right with a force of 45 N. The wagon accelerates to the right at 2 m/s2. How large is the friction force?
A. 3 N
B. 15 N
C. 30 N
D. 45 N
E. 60 N

10. The coefficient of static friction for steel on ice is 0. 1
The coefficient of static friction for steel on ice is The force needed to set a 70-kg skater in motion is about
A. 0.1 N
B. 0.7 N
C. 7 N
69 N
686 N

11. The coefficient of static friction for steel on ice is 0. 1
The coefficient of static friction for steel on ice is The force needed to set a 70-kg skater in motion is about
A. 0.1 N
B. 0.7 N
C. 7 N
69 N
686 N

12. A force just slightly over 40 N is needed to set a 10-kg steel box moving across a wooden floor. The coefficient of static friction is
A. 0.08
B. 0.25
C. 0.4
D. 2.5

13. A force just slightly over 40 N is needed to set a 10-kg steel box moving across a wooden floor. The coefficient of static friction is
A. 0.08
B. 0.25
C. 0.4
D. 2.5

14. The inertia of a body tends to cause the body to
A. Speed up
B. Slow down
C. Resist any change in its motion
D. Fall toward the earth
E. Decelerate due to friction

15. The inertia of a body tends to cause the body to
A. Speed up
B. Slow down
C. Resist any change in its motion
D. Fall toward the earth
E. Decelerate due to friction

16. A car moving along a level road at constant velocity has
A. Only weight acting on it
B. Only weight and the force of the engine acting on it
C. A net force acting on it
D. No net force acting on it
E. No force of any kind acting on it

17. A car moving along a level road at constant velocity has
A. Only weight acting on it
B. Only weight and the force of the engine acting on it
C. A net force acting on it
D. No net force acting on it
E. No force of any kind acting on it

18. A car is towing a trailer and is accelerating on a level road
A car is towing a trailer and is accelerating on a level road. The force that the car exerts on the trailer is
A. Equal to the force the trailer exerts on the car
B. Greater than the force the trailer exerts on the car
C. Equal to the force the trailer exerts on the road
D. Equal to the force the road exerts on the trailer

19. A car is towing a trailer and is accelerating on a level road
A car is towing a trailer and is accelerating on a level road. The force that the car exerts on the trailer is
A. Equal to the force the trailer exerts on the car
B. Greater than the force the trailer exerts on the car
C. Equal to the force the trailer exerts on the road
D. Equal to the force the road exerts on the trailer

20. The frictional force between two surfaces in contact does not depend on
A. The normal force pressing one against the other
B. The areas of the surfaces
C. Whether the surfaces are stationary or in relative motion
D. The types of materials in contact

21. The frictional force between two surfaces in contact does not depend on
A. The normal force pressing one against the other
B. The areas of the surfaces
C. Whether the surfaces are stationary or in relative motion
D. The types of materials in contact

22. B. An acceleration of 0.102 m/s2 C. An acceleration of 1.0 m/s2
When a net force of 1.0 N acts on a 1.0 N object that is able to move freely, the object receives
A. A speed of 1.0 m/s
B. An acceleration of m/s2
C. An acceleration of 1.0 m/s2
D. An acceleration of 9.8 m/s2

23. B. An acceleration of 0.102 m/s2 C. An acceleration of 1.0 m/s2
When a net force of 1.0 N acts on a 1.0 N object that is able to move freely, the object receives
A. A speed of 1.0 m/s
B. An acceleration of m/s2
C. An acceleration of 1.0 m/s2
D. An acceleration of 9.8 m/s2

24. A. FW B. FW – Fy C. FW + Fy D. FW – F E. FW + F F
A block is pulled at constant speed by a FORCE which acts at an angle. The normal force exerted on the block by the surface is equal to
A. FW
B. FW – Fy
C. FW + Fy
D. FW – F
E. FW + F F

25. A. FW B. FW – Fy C. FW + Fy D. FW – F E. FW + F F
A block is pulled at constant speed by a FORCE which acts at an angle. The normal force exerted on the block by the surface is equal to
A. FW
B. FW – Fy
C. FW + Fy
D. FW – F
E. FW + F F

26. A. FW B. FW – Fy C. FW + Fy D. FW – F E. FW + F F
A block is pushed at constant speed by a FORCE which acts at an angle. The normal force exerted on the block by the surface is equal to
A. FW
B. FW – Fy
C. FW + Fy
D. FW – F
E. FW + F F

27. A. FW B. FW – Fy C. FW + Fy D. FW – F E. FW + F F
A block is pushed at constant speed by a FORCE which acts at an angle. The normal force exerted on the block by the surface is equal to
A. FW
B. FW – Fy
C. FW + Fy
D. FW – F
E. FW + F F

28. A force of 1 N is equivalent to
A. 1 kg
B. 1 kg.m/s
C. 1 kg.m/s2
D. 1 kg.m2/s2

29. A force of 1 N is equivalent to
A. 1 kg
B. 1 kg.m/s
C. 1 kg.m/s2
D. 1 kg.m2/s2

30. On Earth, Jodi’s mass is 60 kg
On Earth, Jodi’s mass is 60 kg. If Jodi visited a planet where the acceleration due to gravity is 5.0 m/s2
A. Her mass and weight would both be smaller
B. Her mass and weight would both be larger
C. Her mass would stay the same and her weight would be larger
D. Her mass would stay the same and her weight would be smaller

31. On Earth, Jodi’s mass is 60 kg
On Earth, Jodi’s mass is 60 kg. If Jodi visited a planet where the acceleration due to gravity is 5.0 m/s2
A. Her mass and weight would both be smaller
B. Her mass and weight would both be larger
C. Her mass would stay the same and her weight would be larger
D. Her mass would stay the same and her weight would be smaller

32. Find the acceleration of the 5-kg crate as it slides down the incline (the kinetic coefficient of friction = 0.25)
A m/s2
B m/s2
C m/s2
D. 4.9 m/s2
300

33. Find the acceleration of the 5-kg crate as it slides down the incline (the kinetic coefficient of friction = 0.25)
A m/s2
B m/s2
C m/s2
D. 4.9 m/s2
300

34. Find the tension in the rope below:
A. 16 N
B. 18 N
C. 96 N
D. 98 N
2 kg
10 kg
m = 0.1

35. Find the tension in the rope below:
A. 16 N
B. 18 N
C. 96 N
D. 98 N
2 kg
10 kg
m = 0.1