Answer to Chapter 2 discussion questions2015.docx

Answer to Chapter 2 discussion questions2015.docx - Chapter...

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Chapter 2 concept test questions 1. A train car moves along a long straight track. The graph shows the position as a function of time for this train. The graph shows that the train: A: speeds up all the time. B: slows down all the time. C: speeds up part of the time and slows down part of the time. D: moves at a constant velocity. © Eric Mazur, "Peer Instruction" 1997 Answer: B, the slope of the curve is the speed, the slope is decreasing, so it slows down all the time.
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2. The graph shows position as a function of time for two trains running on parallel tracks. Which is true: A: At time t B , both trains have the same velocity. B: Both trains speed up all the time. C: Both trains have the same velocity at some time before t B . D: Somewhere on the graph, both trains have the same acceleration. © Eric Mazur, "Peer Instruction" 1997 Answer: C, at some time in the graph, the two graphs can have same slope. This means they can have same speed. 3. : Two pitchers are standing side by side, and simultaneously throw baseballs A and B.
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If the balls follow the parabolic trajectories shown, which ball hits the ground first? A: A B: B C: both hit at the same time D: need more information Answer: B, B has lower height, which means its initial vertical velocity smaller. The time it spent in air is given by gt=2v, v is the initial vertical velocity. V smaller means t smaller, so B has smaller flight time. ©  From Mazur, "Peer Instruction" 4. Consider the motion of the ball in the following video. Where will the ball land? A: in front of the cart B: in the cart C: behind the cart.
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