Go Deeper For parents & teachers
A simple machine consisting of a wheel on an axle, with a grooved rim for a rope, belt, or cable. A single fixed pulley redirects force without mechanical advantage; movable pulleys and block-and-tackle systems trade distance for force, so pulling a long length of rope a small distance can lift a heavy load a short distance. Pulleys are one of the six classical simple machines defined in ancient mechanics.
Appears In
The Burning Mountain Chapter 10 — Bridge of Nerves
"… watching Gertie shout for more rock baskets while Cracker argued with a pulley and Monty marched a donkey off the bridge because donkeys were not exempt …"
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