Ch4_TestBank - Chapter 4, The Laws of Motion CHAPTER 4 4.1...

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Chapter 4, The Laws of Motion 38 C HAPTER 4 4.1 Forces 4.2 Newton’s First Law 4.3 Newton’s Second Law 4.4 Newton’s Third Law 1. Which of the following is an example of the type of force that acts at a distance? a. gravitational b. magnetic c. electrical d. all of the above 2. If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero. b. there are no forces acting on the object. c. the object is accelerating. d. the object is losing mass. 3. Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated into Newton’s laws of motion? a. An object’s acceleration is inversely proportional to its mass. b. For every action there is an equal but opposite reaction. c. The natural condition for a moving object is to remain in motion. d. The natural condition for a moving object is to come to rest. 4. What condition must apply to a system’s state of motion for it to be regarded as an inertial frame of reference? a. in decreasing velocity b. in constant velocity c. in constant acceleration d. in increasing acceleration 5. A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration? a. 35 m/s 2 b. 7.0 m/s 2 c. 5.0 m/s 2 d. 0.71 m/s 2
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Chapter 4, The Laws of Motion 39 6. An astronaut applies a force of 500 N to an asteroid, and it accelerates at 7.00 m/s 2 . What is the asteroid’s mass? a. 71 kg b. 135 kg c. 441 kg d. 3 500 kg 7. Two ropes are attached to a 40-kg object. The first rope applies a force of 25 N and the second, 40 N. If the two ropes are perpendicular to each other, what is the resultant acceleration of the object? a. 1.2 m/s 2 b. 3.0 m/s 2 c. 25 m/s 2 d. 47 m/s 2 8. Two forces act on a 6.00-kg object. One of the forces is 10.0 N. If the object accelerates at 2.00 m/s 2 , what is the greatest possible magnitude of the other force? a. 1.0 N b. 2.0 N c. 22.0 N d. 34.0 N 9. The acceleration due to gravity on the Moon’s surface is one-sixth that on Earth. An astronaut’s life support backpack weighs 300 lb on Earth. What does it weigh on the Moon? a. 1 800 lb b. 300 lb c. 135 lb d. 50 lb 10. The acceleration due to gravity on the Moon’s surface is one-sixth that on Earth. What net force would be required to accelerate a 20-kg object at 6.0 m/s 2 on the moon? a. 1.3 N b. 20 N c. 33 N d. 120 N 11. If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object’s condition? The object is: a. at rest. b. moving with a constant velocity.
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Chapter 4, The Laws of Motion 40 c. being accelerated. d. losing mass. 12. A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45 ° N of W). What is the magnitude of the resultant acceleration?
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This note was uploaded on 10/01/2008 for the course PHY 2054 taught by Professor Avery during the Spring '08 term at University of Florida.

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Ch4_TestBank - Chapter 4, The Laws of Motion CHAPTER 4 4.1...

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