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Back to 4.4 Newton’s Third Law of Motion: Symmetry in Forces

4.4 Exercise 3

Avg difficulty 2.5

Which of the following is true?

  1. Earth exerts a force due to gravity on your body, and your body exerts a smaller force on the Earth, because your mass is smaller than the mass of the Earth.
  2. The Moon orbits the Earth because the Earth exerts a force on the Moon and the Moon exerts a force equal in magnitude and direction on the Earth.
  3. A rocket taking off exerts a force on the Earth equal to the force the Earth exerts on the rocket.
  4. An airplane cruising at a constant speed is not affected by gravity.

OpenStax College Physics 2e, 4.4 Newton’s Third Law of Motion: Symmetry in Forces, exercise 3

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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.