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Physics / University Physics 13 / Chapter 5 / Problem 15DQ

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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You are pushing a large crate from the back of a freight

Chapter 8, Problem 15DQ

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QUESTION:

You are pushing a large crate from the back of a freight elevator to the front as the elevator is moving to the next floor. In which situation is the force you must apply to move the crate the least, and in which is it the greatest: when the elevator is accelerating upward, when it is accelerating downward, or when it is traveling at constant speed? Explain.

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QUESTION:

You are pushing a large crate from the back of a freight elevator to the front as the elevator is moving to the next floor. In which situation is the force you must apply to move the crate the least, and in which is it the greatest: when the elevator is accelerating upward, when it is accelerating downward, or when it is traveling at constant speed? Explain.

ANSWER:

Solution 15DQ Let m be the mass of the elevator. 1. Suppose the elevator is accelerating upward with an acceleration of a. Therefore, the net acceleration of the crate is (a + g). Therefore, total force on the crate is m(a + g). 2. Let the elevator

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