Abstract

IT has been affirmed frequently that Aristotle’s Physics contains no concept of inertia. Indeed this character, coupled with his great subsequent influence up to the Renaissance, is often considered a key reason for the charge that Aristotle produced a set-back of one thousand years in the development of physics. Our purpose here is to attempt to put in a balanced perspective the Aristotelian doctrine and ancient anticipations of the concept of inertia; no attempt is made to study the medieval period. A classic passage cited to illustrate the position of Aristotle is the analysis of projectile motion in Book VIII of the Physics.