Chapter 05 Test A. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.

Transcription

1 Class: Date: Chapter 05 Test A Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The SI unit of force preferred by scientists is the: a. kilogram. b. newton. c. mima. d. pound. 2. Weight is a force that depends on mass and: a. friction. b. gravity. c. magnetism. d. energy conservation. 3. Which is the best description for the force vector drawn above? a. +3 cm b. +3 N c. -3 cm d. -3 N 4. Which of the following forces is a contact force? a. Gravity b. Friction c. Magnetism d. Electricity 5. Which of the following is the largest unit of force? a. Kilogram b. Ounce c. Pound d. Newton 1

2 6. 7. Two dogs are tugging on opposite ends of a rope toy as shown in the picture. If each dog pulls with 50 N of force, what is the tension in the rope toy? a. 0 N b. 50 N c. 100 N d. 200 N The diagram shows two stacks of books with masses of 3 kg and 6 kg, respectively. How do their weights compare? a. They have the same weight. b. The 6 kg stack has 1/2 the weight of the 3 kg stack. c. The 6 kg stack has 1/3 the weight than the 3 kg stack. d. The 6 kg stack has twice the weight of the 3 kg stack. 8. Brandon weighs 600. newtons. What is his mass? a kg b. 9.8 kg c kg d kg 9. Of the following measurements, the one that would be incomplete without giving a direction is: a. time. b. temperature. c. length. d. force. 10. Compared to your weight and mass on Earth, if you were on the Moon: a. your weight and mass would be less. b. your weight would be less but your mass would remain the same. c. your weight would remain the same, but your mass would be less. d. your weight would increase, but your mass would remain the same. 2

3 11. Which one of the following is NOT TRUE concerning mass and weight? a. Mass is a property of matter and weight comes from gravity acting on matter. b. An object at rest has the same mass everywhere, but its weight depends on the strength of gravity where the object is located. c. Mass is measured in kilograms and weight is measured in newtons. d. Mass is measured in newtons and weight is measured in pounds. 12. Two identical springs are shown in the picture above. If the first spring exerts a force of 10 N when stretched 10 cm, what is the force exerted by the second spring when stretched 5 cm? a. 1 N b. 5 N c. 10 N d. 20 N 13. What does a maglev train use to reduce friction? a. Oil b. Air cushion c. Ball bearings d. Water 14. A force that resists motion is called: a. weight. b. motion. c. equilibrium. d. friction. 15. As a box is sliding down a ramp, a 10-N force of gravity is pulling the box down the ramp while a 2-N force of friction acts to stop the box. What is the net force accelerating the box down the ramp? a. 5 N b. 8 N c. 10 N d. 12 N 16. Ball bearings decrease friction in rotating motion because: a. they are made of hard steel. b. they replace sliding friction with rolling friction. c. they separate surfaces with a cushion of air. d. they can be made in all sizes to fit different machines. 3

4 17. Which of the following would increase the sliding friction between your foot and the floor? a. Increasing the weight on your foot. b. Decreasing the weight on your foot. c. Putting water between your foot and the floor. d. Separating your foot and the floor. Figure 5-1A 18. Figure 5-1A shows a box being pushed from left to right. Which shows the force of sliding friction on the box? a. A b. B c. C d. D 19. The tires on a car have grooves in them. How do these grooves affect the friction between the tires and the road during wet weather? a. They increase friction. b. They decrease friction. c. They have no effect on friction. d. They first decrease, then increase friction. 20. How can the force of friction between two surfaces be reduced? a. By changing rolling friction to sliding friction. b. By making smooth surfaces rougher. c. By separating surfaces with a lubricant. d. By increasing the force between the surfaces. 21. How does friction affect the acceleration of a coasting bike? a. It increases the acceleration. b. It decreases the acceleration. c. It does not change the acceleration. d. It increases then decreases the acceleration. 22. The term that means all of the forces together on an object is: a. normal force. b. net force. c. frictional force. d. weight. 4

5 23. A net force must be applied to an object to do all of the following EXCEPT: a. turn. b. maintain constant speed. c. slow down. d. stop moving. 24. When the forces on an object are balanced, we say that the object: a. is in equilibrium. b. is accelerating. c. must be at rest. d. must be moving at a constant speed. 25. In the picture below, a girl is sitting motionless on a swing. What is the net force on the girl? a. 0 newtons b. 245 newtons upwards c. 490 newtons upwards d. 490 newtons downwards 26. Which of the following is an object in equilibrium? a. A box resting on a table without moving b. A box being pushed from rest to a speed of 5 cm/s c. A box falling freely in the air with no strings attached d. A box thrown up into the air 27. If the net force on a moving object is zero: a. the object will slow down and stop. b. the object will change direction. c. the object will change speed. d. the object will not change direction or speed. 5

6 28. The picture below shows 4 forces applied to an airplane. 29. Due to the forces acting on the airplane, the airplane: a. speeds up. b. slows down. c. goes higher. d. goes lower. The picture shows all the forces acting on a windsurfer. If the forces are balanced and the windsurfer is traveling at constant velocity, what is the value of force F? a. 100 N b. 200 N c. 1,000 N d. 2,100 N 30. A B C D Which graph of motion shows the motion of an object in equilibrium? a. A b. B c. C d. D 6