the.com/pulley
A wheel that tricks gravity into thinking you're stronger than you are.
means A grooved wheel that a rope or belt runs over, letting you change the direction of a pulling force and, in combination, lift heavy loads with less effort.
from From Middle English 'poley,' borrowed from Old French 'polie,' which traces back through Medieval Latin 'polia' — likely ultimately from a Greek word, possibly related to 'polos,' a pivot or axle, the same root that gives us 'pole.' Fittingly for a tool of turning, the name itself seems to spin around the idea of an axis.
- force divider
- Each rope section cuts the effort needed
- ancient tech
- Archimedes used them to drag warships solo
- trade-off
- You pull farther to lift easier
- everywhere
- Elevators, cranes, and gym machines all hide pulleys
panama canal locks — uses massive pulley systems to lift ships 85 feet above sea level
otis elevator — invented 1852, uses pulley system in every modern high-rise building
ship rigging — sailing vessels use complex pulley blocks to control sails and anchors