MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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1 FLEX Physical Science AP Physics C Newton's Laws --- Conceptual Questions MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is A) exactly 1500 N whether or not the box moves. B) less than 1500 N if the box moves. C) greater than 1500 N if the bat bounces back. D) exactly 1500 N only if the box does not move. E) greater than 1500 N if the box moves. 2) Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? 1) 2) A) B) C) D) 1

2 E) 3) A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is A) down the hill and greater than the weight of the car. B) up the hill and greater than the weight of the car. C) down the hill and equal to the weight of the car. D) zero. E) up the hill and equal to the weight of the car. 4) In order to lift a bucket of concrete, you must pull up harder on the bucket than it pulls down on you. A) True B) False 5) A box of mass m is pulled with a constant acceleration a along a horizontal frictionless floor by a wire that makes an angle of 15 above the horizontal. If T is the tension in this wire, then A) T < ma. B) T = ma. C) T > ma. 6) Consider what happens when you jump up in the air. Which of the following is the most accurate statement? A) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. B) It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. C) When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because F1 > F2. D) You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. E) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. 3) 4) 5) 6) 2

3 7) Two objects, each of weight W, hang vertically by spring scales as shown in the figure. The pulleys and the strings attached to the objects have negligible weight, and there is no appreciable friction in the pulleys. The reading in each scale is 7) A) more than W, but not quite twice as much. B) 2W. C) more than 2W. D) W. E) less than W. 8) A fish weighing 16 N is weighed using two spring scales, each of negligible weight, as shown in the figure. What will be the readings of the scales? 8) A) Each scale will read 16 N. B) Each scale will read 8 N. C) The bottom scale will read 16 N, and the top scale will read zero. D) The scales will have different readings, but the sum of the two readings will be 16 N. E) The top scale will read 16 N, and the bottom scale will read zero. 3

4 9) A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog A) does not move left or right, but the back of the truck moves towards the dog. B) moves to the right at the same rate as the truck, so it doesn't slide. C) moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck. D) moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck. 10) You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that A) the velocity of the bus is forward. B) the velocity of the bus is backward. C) You cannot conclude anything about the direction of the velocity of the bus. 9) 10) 4

5 Answer Key Testname: NEWTON'S LAWS PHYSICS C CONCEPTUAL QUESTIONS 1) A 2) A 3) D 4) B 5) C 6) A 7) D 8) A 9) A 10) C 5

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