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In an elevator problem, how do we know to use only the 2nd Newton law of motion for scale or elevator at rest?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter9: Energy In Nonisolated Systems

Section: Chapter Questions

Problem 1PQ: Pick an isolated system for the following scenarios while including the fewest number of objects as...

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!

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In an elevator problem, how do we know to use only the 2nd Newton law of motion for scale or elevator at rest?

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Consider the figure below representing a person standing on a scale inside an elevator.

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When the elevator is at rest, acceleration is zero.

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Using Newton’s second law,

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