By , Ansel Olsen
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By , Ansel Olsen
A pulley is a wheel & a rope. Pulleys make lifting objects easier.
Pulleys may have been invented by Archimedes.
It was invented more than 2,500 years ago.
Pulleys are used to make objects go up by pulling down.
Pulleys were partially made to make work easier.
Bike pulleys Chain pulleys Water pulleys Motor pulleys
Elevator pulleys Food pulleys
Flagpole pulleys Toilet paper
pulleys
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