simple machines

by oriana


A pulley is a simple machine that carrys heavy things like bricks and all sort of stuff whith less efort. It is made out of a rope or a belt wrape around a wheel the wheel is attache to brackets on the side so that they can turn freely.Archimedes invented the pulley.How a pulley works is that when the rope or belt is wrape around the wheel is you pull the rope or belt and you can lift up heavy things like if you have a well you can attach the wheel to the top and the rope or belt to the bucket and to the wheel and put it inside the well and and pull the rope or belt to get some water.
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