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7.5 Exercise 1

Avg difficulty 2.5

You are in a room in a basement with a smooth concrete floor (friction force equals 40 N) and a nice rug (friction force equals 55 N) that is 3 m by 4 m. However, you have to push a very heavy box from one corner of the rug to the opposite corner of the rug. Will you do more work against friction going around the floor or across the rug, and how much extra?

  1. Across the rug is 275 J extra
  2. Around the floor is 5 J extra
  3. Across the rug is 5 J extra
  4. Around the floor is 280 J extra

OpenStax College Physics 2e, 7.5 Nonconservative Forces, exercise 1

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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.