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Physics / Physics with MasteringPhysics 4 / Chapter 9 / Problem 1CQ

Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker

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If you drop your keys, their momentum increases as they

Chapter 9, Problem 1CQ

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QUESTION:

Problem 1CQ

If you drop your keys, their momentum increases as they fall. Why is the momentum of the keys not conserved? Does this mean that the momentum of the universe increases as the keys fail? Explain.

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QUESTION:

Problem 1CQ

If you drop your keys, their momentum increases as they fall. Why is the momentum of the keys not conserved? Does this mean that the momentum of the universe increases as the keys fail? Explain.

ANSWER:

Step 1 of 2

We have to remind ourselves that the momentum of a system remains conserved only if the net external forces is 0. The internal forces does not affect the momentum of the system.

Therefore, for a body to have its momentum conserved,

For a falling keys, the net external forces is not zero. Thus, the momentum of the keys as it falls is increasing or in other words, momentum is not conserved.

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