What is the definition of a pulley?

Answer 1

pul⋅ley 

 /ˈpʊli/ Show Spelled Pronunciation [pool-ee] Show IPA-noun, plural -leys.1.a wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines.2.a combination of such wheels in a block, or of such wheels or blocks in a tackle, to increase the force applied.3.a wheel driven by or driving a belt or the like, used to deliver force to a machine, another belt, etc., at a certain speed and torque.

pul·ley (pŏŏl'ē)

n. pl. pul·leys

1. A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.

2. A wheel turned by or driving a belt.

[Middle English poley, from Old French polie and from Medieval Latin poliva, both ultimately from Greek polos, axis; see kwel-1 in Indo-European roots.]

pulleyScience Dictionarypulley (pl'ē) Pronunciation Key

A machine consisting of a wheel over which a pulled rope or chain runs to change the direction of the pull used for lifting a load. Combinations of two or more pulleys working together reduce the force needed to lift a load. See also block and tackle.

Answer 2

A pulley is a simple machine that consists of a wheel on an axle or shaft, typically used to lift heavy objects. It allows for the redirection of force to make it easier to lift loads by changing the direction or magnitude of the force applied.