College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 4 - Conceptual Questions - Page 145: 8

Answer

A cord is called an "ideal cord" when we can assume that the cord does not stretch and it has a mass of zero. A pulley is called an "ideal pulley" when we can assume that the pulley has no friction and it has a mass of zero.

Work Step by Step

A cord is called an "ideal cord" when we can assume that the cord does not stretch and it has a mass of zero. This simplifies physics questions as we don't need to consider the mass of the cord or any effects of the cord when solving the question. Similarly, a pulley is called an "ideal pulley" when we can assume that the pulley has no friction and it has a mass of zero. This simplifies physics questions as we don't need to consider the mass of the pulley or any effects of the pulley when solving the question.
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