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Theory of impetus
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Theory of impetus : ウィキペディア英語版
Theory of impetus
The theory of impetus was an auxiliary or secondary theory of Aristotelian dynamics, put forth initially to explain projectile motion against gravity. It was introduced by John Philoponus in the 6th century〔 ISBN is for volume 7, not the set.〕〔 Link to (page 307 ) from Google's copy of 2008 reprint.〕 and elaborated by Nur ad-Din al-Bitruji at the end of the 12th century,〔 ((PDF version ))〕 but was only established in western scientific thought by Jean Buridan in the 14th century. It is the intellectual precursor to the concepts of inertia, momentum and acceleration in classical mechanics.
==Philoponan theory==

In the 6th century, John Philoponus partly accepted Aristotle's theory that "continuation of motion depends on continued action of a force," but modified it to include his idea that the hurled body acquires a motive power or inclination for forced movement from the agent producing the initial motion and that this power secures the continuation of such motion. However, he argued that this impressed virtue was temporary; that it was a self-expending inclination, and thus the violent motion produced comes to an end, changing back into natural motion.〔Aydin Sayili (1987), "Ibn Sīnā and Buridan on the Motion of the Projectile", ''Annals of the New York Academy of Sciences'' 500 (1): 477–482 ()〕

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