Big or small, pulleys help you move it all. You couldn't raise a flag and cranes couldn't move heavy objects without the help of pulleys. Read Pulleys to the Rescue to learn what pulleys are, how they work, and how these simple machines can save the day.
Table of Contents
A helpful pulley Work it A pulley in time Fixed pulleys Movable pulleys What would we do without pulleys? Working together Pulleys everywhere.