CHAPTER 5 Newton

CHAPTER 5 Newton - CHAPTER 5 Newton's Laws of Motion 1)...

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CHAPTER 5 Newton's Laws of Motion 1) Mass is a measure of how difficult it is to change the velocity of an object. Answer: TRUE Diff: 1 Page Ref: Sec. 5-1 2) Force is a vector quantity. Answer: TRUE Diff: 1 Page Ref: Sec. 5-1 3) A force is required for an object to move. Answer: FALSE Diff: 1 Page Ref: Sec. 5-2 4) An object always moves in the direction of the net force pushing on it. Answer: FALSE Diff: 1 Page Ref: Sec. 5-1 5) When a ball is thrown upwards, it reaches its maximum height when the force pushing it up is equal to its weight. Answer: FALSE Diff: 1 Page Ref: Sec. 5-1 6) An object is moving with constant velocity. Which of the following statements is true? A) A constant force is being applied in the direction of motion. B) There are no forces acting on the object. C) The net force on the object is zero N. D) There is no frictional force acting on the object. Answer: C Diff: 1 Page Ref: Sec. 5-2 7) The acceleration of an object does not have to be in the same direction as the net force applied to it. Answer: FALSE Diff: 1 Page Ref: Sec. 5-3 8) An object moving along a curved path with constant speed does not have a net force acting on it. Answer: FALSE Diff: 1 Page Ref: Sec. 5-3 9) When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This means that A) the acceleration is equal to g . B) the force of air resistance is equal to zero N. C) the effect of gravity has died down. D) the force of air resistance is equal to the weight of the parachutist. Answer: D Diff: 1 Page Ref: Sec. 5-3 10) When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This is an example of A) Newton's First Law of motion. B) Newton's Second Law of motion. C) Newton's Third Law of motion. D) All of Newton's laws apply to this situation. Answer: D Diff: 1 Page Ref: Sec. 5-3 11) A force of 120 N is applied to an object whose mass is 30 kg. The object's acceleration is
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A) 3600 m/s 2 . B) 150 m/s 2 . C) 4.0 m/s 2 . D) 0.25 m/s 2 . Answer: C Diff: 1 Page Ref: Sec. 5-3 12) A 100-kg astronaut being trained for space work is placed in a rocket-propelled sled to see what acceleration he can withstand. When the acceleration reaches 70 m/s 2 he loses consciousness. What force is he exerting against the back of the seat at that point? Answer: 7000 N Diff: 1 Page Ref: Sec. 5-3 13) Why does it hurt more to fall from a certain height to the ground than it does to fall from the same height into a swimming pool? Answer: You go much further into the water before coming to a stop, thus your acceleration is much smaller, and the force exerted by the water is much smaller than that exerted by the ground. Diff: 1
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CHAPTER 5 Newton - CHAPTER 5 Newton's Laws of Motion 1)...

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