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pulley noun [C]. âº a âpiece of âequipment for âmoving âheavy âobjects up or down, consisting of a âsmall âwheel over which a ârope or âchain âattached to the âobject can be âeasily âraised or âlowered: The âblocks of âstone had to be âlifted into âposition with a âsystem of pulleys.
Shovels, nails a pulley is simple machine that uses grooved wheels and rope to raise, lower wedge an object with at least one slanting side ending in sharp edge, the contribution of early civilisation. It can be used to separate two objects or a simple machine is mechanical device that changes the direction magnitude of force.