He's famous for his work on gravity and motion (6)

I believe the answer is:

newton

(Other definitions for newton that I've seen before include "Famous mathematician" , "Supposedly, an apple fell on his head" , "Englishman known for his work on gravity and motion" , "Unit of force - English polymath, d. 1727" , "Sir Isaac . . . . . ., great English mathematician" .)

I've seen this clue in The Irish Times.

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