dynamics i: force

Action Reaction summary



  • Newton’s third law of motion (also known as the law of action-reaction) states that…
    • for every action there is an equal and opposite reaction.
  • A force is an interaction between two objects.
  • Forces always occur in pairs that…
    • are arbitrarily assigned the names action and reaction,
    • are of the same type,
    • have the same magnitude,
    • act on different objects,
    • act in opposite directions, and
    • may have different effects (since acceleration is inversely proportional to mass).
  • Supplementary Materials
    • Original statement in Latin from Newton’s Principia with English translation

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