Moveable pulley as second class lever, with arms (r_1, r_2) and forces (F_1 and F_2). P is the pivot point (fulcrum).
<a href="//commons.wikimedia.org/w/index.php?title=User:MikeRun&amp;action=edit&amp;redlink=1" class="new" title="User:MikeRun (page does not exist)">MikeRun</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>, based on <a href="//commons.wikimedia.org/wiki/File:Power_pulley.svg" class="image"><img alt="Power pulley.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Power_pulley.svg/100px-Power_pulley.svg.png" decoding="async" width="100" height="146" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Power_pulley.svg/150px-Power_pulley.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Power_pulley.svg/200px-Power_pulley.svg.png 2x" data-file-width="475" data-file-height="695"></a>