Chapter 4

# Chapter 4 - 9 kg 5 kg CHAPTER 4 (NEWTONS 3 LAWS) 1. A 7 kg...

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5 kg 9 kg C HAPTER 4 (N EWTONS 3 L AWS ) 1. A 7 kg bowling ball experiences a net force of 5 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 2. An astronaut applies a force of 500 N to an asteroid and it accelerates at 7 m/s 2 . What is the asteroid’s mass? a. 71 kg b. 135 kg c. 441 kg d. 3500 kg 3. Which of the following is an example of the type of force which acts at a distance? a. gravitational b. magnetic c. electrical d. all of the above 4. 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. 5. Two ropes are attached to a 40 kg object. The first rope applies a force of 25 N and the second, 40 N directed. 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. 1800 lb b. 300 lb

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d. 50 lb 7. A block of mass 5.0 kg rests on a horizontal surface where the coefficient of sliding kinetic friction between the two is 0.2. A string attached to the block is pulled horizontally, resulting in a 2 m/s 2 acceleration by the block. Find the tension in the string. ( g = 9.8 m/s 2 ) a. 0.2 N b. 9.8 N c. 19.8 N d. 10 N 8. Two blocks joined by a string have masses of 6 and 9 kg. They rest on a frictionless horizontal surface. A 2nd string, attached only to the 9 kg block, has horizontal force = 30 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks. a. 18 N b. 28 N c. 12 N d. 15 N 9. If we know that a 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 must we assume: a. There is no net force acting on the object. b. There are no forces acting on the object. c. The object is accelerating. d. The object is losing mass. 11. The statement by Newton that “for every action there is an opposite but equal reaction” is regarded as which of his laws of motion? a. first b. second c. third d. fourth 12. 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
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## Chapter 4 - 9 kg 5 kg CHAPTER 4 (NEWTONS 3 LAWS) 1. A 7 kg...

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