John Buridan

Affiliations: 
Faculty of Arts Universite de Paris, Paris, Île-de-France, France 
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"John Buridan"
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Jean Buridan (ca. 1300 – after 1358).
Buridan's concept of impetus is closely related to the modern concept of momentum. Buridan saw impetus as causing the motion of the object. Buridan anticipated Newton when he wrote, "... after leaving the arm of the thrower, the projectile would be moved by an impetus given to it by the thrower and would continue to be moved as long as the impetus remained stronger than the resistance, and would be of infinite duration were it not diminished and corrupted by a contrary force resisting it or by something inclining it to a contrary motion."
http://en.wikipedia.org/wiki/Jean_Buridan
http://plato.stanford.edu/entries/buridan/

Cross-listing: Philosophy Tree