SIMPLE MACHINES PULLEYS Nancy Dickmann BROWN BEAR BOOKS
What Is a Pulley A pulley looks simple It is a wheel with a rope looped over it But a pulley can do something amazing It can help you lift heavy objects A flagpole has a pulley at the top You pull on the rope This raises the flag 4
An axle is a rod It goes through the pulley's wheel The wheel spins around the axle The wheel's edges usually stick out a little bit They keep the rope from slipping off axle wheel rope 5
