Chapter 7: Work, Power, and Energy

Chapter Objectives

After this chapter, you will be able to:

  • Explain how an object must be displaced for a force on it to do work.
  • Explain how relative directions of force and displacement determine whether the work done is positive, negative, or zero.
  • Explain work as a transfer of energy and net work as the work done by the net force.
  • Explain gravitational potential energy in terms of work done against gravity.
  • Show that the gravitational potential energy of an object of mass m at height h on Earth is given by PEg = mgh.
  • Explain the law of the conservation of energy.
  • Calculate power by calculating changes in energy over time.
  • Explain the human body’s consumption of energy when at rest vs. when engaged in activities that do useful work.
  • Calculate the conversion of chemical energy in food into useful work.



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Biomechanics of Human Movement Copyright © August 22, 2016 by OpenStax is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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