📜 Theorem, law or theory

Avicenna's theory of impetus (mayl)

Teoría del ímpetu (mayl) de Avicena

Date
c. 1027 · confidence medium
Place
Isfahan, Iran
Credited to
Ibn Sina (Avicenna)
People
👤 Avicena980–1037
Field
Cosmos & Earth

⚠️ Disputed: the sources disagree.

What was discovered

He proposed that the thrower imparts to the projectile an inclination (mayl) that is retained and only dissipates through resistance from the medium, so that in a vacuum motion would continue indefinitely. It breaks with the Aristotelian physics of the continuous mover.

John Philoponus (6th century) had already proposed an impressed force; how much of Buridan's theory derives from Avicenna via Latin translations is debated.

What it led to

  • Buridan's theory of impetus
  • critique of Aristotelian dynamics
  • principle of inertia
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Sources✓ verified 2026-09-25