why are pulleys useful

 

Last wednesday we done a science exhibition,our experiment 

was a pulley,How to use a pulley, is when you use a rope and a pulley and put the rope on the pulley and then you holed the pulley in side the air and you put a heavy weight on the bottom on the rope and then pull on the rope and the you can lift the heavy weight .The pulley is much easier to pick up heavy things but if you pick up a heavy thing with your hands you will struggle trying to pick it up but if you use a pulley and a rope then it will be much easier.