Pulleys are helpful!
A pulley is a simple machines and the parts of are the rope, the wheel, and the axle. we need it because we work a lot faster with it and construction worker uses it to work faster .So I will tell you how pulley are helpful so say you have to get 10 bricks up to your treehouse what simple machine would you use .You`d need a pulley. And
this type of pulley lifts the stuff that weights tons
did you know an american flag has a pulley on it
just a regular pulley
this is a regular pulley