---
title: "stationary-action principle"
source: https://www.jemoka.com/posts/kbhstationary_action_principle/
---

The stationary-action principle states that, in a dynamic system, the equations of motion of that system is yielded as the &ldquo;stationary points&rdquo; of the system&rsquo;s action. i.e. the points of &ldquo;least&rdquo; action. (i.e. a ball sliding down a ramp is nice, but you don&rsquo;t expect it&mdash;in that system&mdash;to fly off the ramp, do a turn, and then fly down.
