An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Newton's third law of motion
  سومین قانون ِ نیوتنی ِ جنبش  
sevomin qânun-e Newtoni-ye jonbeš (#)
Fr.: troisième loi newtonienne de mouvement  

In a system where no external forces are present, every action force is always opposed by an equal and opposite reaction.

See also: → Newton; → third; → law; → motion.