English physicist, remembered for his law of gravitation, d. 1726 (6)

I believe the answer is:

newton

(Other definitions for newton that I've seen before include "Scientist formulating laws of motion" , "Scientist - unit of force" , "He discovered the law of gravity" , "SI unit of force" , "'English physicist, described the law of gravity (6)'" .)

I've seen this clue in The Guardian.

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