Action / Reaction, Part 1

  • Due Oct 13, 2016 at 8:59am
  • Points 2
  • Questions 2
  • Available until Oct 13, 2016 at 8:59am
  • Time Limit None
  • Allowed Attempts Unlimited


Watch the following video tutorial the Action / Reaction Principle, also known as Newton's Third Law of Motion.

[PDF of Slides]


• For every action force there is an equal reaction force in the opposite direction.
• Action/reaction forces always occur in pairs.
• Action/reaction forces are simultaneous.
• The magnitudes of the action/reaction forces are equal but the resulting accelerations are usually not equal.
• By the Law of Acceleration, when objects or characters push apart the heavier one will accelerate less than the lighter one.
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Note that if you want to watch all the videos in this module as a single YouTube playlist, visit:

Optional: Watch this video explaining the Action/Reaction Principle (Newton's Third Law) as it applies to the force of gravity:


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