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7.4 Exercise 8

Avg difficulty 2.5

Old-fashioned pocket watches needed to be wound daily so they wouldn’t run down and lose time, due to the friction in the internal components. This required a large number of turns of the winding key, but not much force per turn, and it was possible to overwind and break the watch. How was the energy stored?

  1. A small mass raised a long distance
  2. A large mass raised a short distance
  3. A weak spring deformed a long way
  4. A strong spring deformed a short way

OpenStax College Physics 2e, 7.4 Conservative Forces and Potential Energy, exercise 8

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.