A thrown projectile continues moving after release because the surrounding air rushes around it and supplies the continuing external push.

Projectile motion exposed a basic difficulty in Aristotelian mechanics.

If motion normally requires a mover acting on what is moved, what keeps a stone or javelin going after it leaves the hand?

One Aristotelian answer, later called antiperistasis, held that the projectile displaced air and the surrounding air then rushed around into the space behind it, helping push it forward. The medium that also resisted motion therefore became part of the continuing cause of motion.

The explanation attracted criticism long before Galileo. John Philoponus challenged aspects of Aristotelian projectile theory in late antiquity. Medieval Islamic thinkers developed concepts of mayl, or inclination. In the fourteenth century, Jean Buridan gave impetus theory an especially influential form: the thrower impresses an impetus—a continuing motive tendency—into the projectile, and the projectile keeps moving while that impetus exceeds resisting influences.

Buridan’s impetus was not yet Newtonian inertia. It was still a positive impressed quality that could be depleted or corrupted. But it removed the need for the surrounding air to act as a relay of movers.

Later inertial mechanics made the conceptual reversal complete: continuing uniform motion does not need a continuing cause; it is change in motion that requires net force.

Because Aristotelian projectile explanations and their medieval replacements developed in stages, the card is excluded from exact lifespan statistics.