CP Workbook
Momentum and Kinetic Energy
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Refer to the following information for the next sixteen questions.
A Honda Civic and a Lincoln Town Car are initially at rest on a horizontal parking lot at the edge of a steep cliff. For simplicity, we assume that the Town Car has twice as much mass as the Civic. Equal constant forces are applied to each car and they accelerate across equal distances (we ignore the effects of friction). When they reach the far end of the lot the force is suddenly removed, whereupon they sail through the air and crash to the ground below. (The cars are beat up to begin with, and this is a scientific experiment!)
Which car has the greater acceleration?
Honda Civic
Lincoln Town Car
both cars are the same
Which car spends more time along the surface of the lot?
Honda Civic
Lincoln Town Car
both cars are the same
Which car is moving faster when it reaches the edge of the cliff?
Honda Civic
Lincoln Town Car
both cars are the same
Which car has the larger impulse imparted to it by the applied force?
Honda Civic
Lincoln Town Car
both cars are the same
Defend your answer.
Which car has the greater momentum at the edge of the cliff?
Honda Civic
Lincoln Town Car
both cars are the same
Defend your answer.
Which car has the greater work done on it by the applied force?
Honda Civic
Lincoln Town Car
both cars are the same
Defend your answer in terms of the distance traveled.
Which car has the greater kinetic energy at the edge of the cliff?
Honda Civic
Lincoln Town Car
both cars are the same
Does this answer follow from your explanation regarding the work done on the cars?
yes
no
Does it contradict your answer with regard to which car received the greater impulse?
yes
no
Why or why not?
Which car spends more time in the air, from the edge of the cliff to the ground below?
Honda Civic
Lincoln Town Car
both cars are the same
Which car lands farthest horizontally from the edge of the cliff onto the ground below?
Honda Civic
Lincoln Town Car
both cars are the same
Challenge:
Suppose the slower car crashes a horizontal distance of 10 m from the ledge. Then at what horizontal distance does the faster car hit?
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Paul G. Hewitt
Copyright © 1984-2005
All rights reserved.
Used with written
permission.
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