# Ch04 - Chapter 4 The Laws of Motion CHAPTER 4 1 A 7.0-kg bowling ball experiences a net force of 5.0 N What will be its acceleration a 35 m/s2 b

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Chapter 4, The Laws of Motion C HAPTER 4 1. 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 5. 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 6. Acceleration due to gravity on the Moon’s surface is 1/6th 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 9. 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. c. being accelerated. d. losing mass. 10. 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. 31

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Chapter 4, The Laws of Motion 13. 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? a. 2.2 m/s 2 b. 2.1 m/s 2 c. 1.5 m/s 2 d. 3.0 m/s 2 15. A cart of weight 20 N is accelerated across a level surface at 0.15 m/s 2 . What net force acts on the wagon? ( g = 9.8 m/s 2 ) a. 0.92 N b. 0.31 N c. 3.0 N d. 4.5 N 17. Two blocks of masses 20 kg and 8 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8-kg mass is another light string, which a person
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## This note was uploaded on 07/25/2008 for the course PHY 231C taught by Professor Pratt during the Spring '06 term at Michigan State University.

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Ch04 - Chapter 4 The Laws of Motion CHAPTER 4 1 A 7.0-kg bowling ball experiences a net force of 5.0 N What will be its acceleration a 35 m/s2 b

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