An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Newton's first law of motion
  نخستین قانون ِ نیوتنی ِ جنبش  
naxostin qânun-e Newtoni-ye jonbeš (#)
Fr.: première loi newtonienne de mouvement  

A body continues in its state of constant velocity (which may be zero) unless it is acted upon by an external force.

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