Get ready to learn all about pulleys! In this BrainPOP movie, Tim and Moby teach you all about these simple machines, which are among the most useful tools ever invented. Discover how pulleys are designed to decrease the amount of effort you have to expend in order to move a heavy object. You’ll find out about the concepts of resistance force and effort force and how they’re used in different pulleys. You’ll also learn about the components that make up a pulley and how using two of these devices can enable a person to lift an object that weighs more than she does! You won’t have to expend much effort to watch this movie — so have fun!

Learn More:

What is a pulley?

What is the difference between a fixed pulley and a movable pulley?

In a fixed pulley, is the effort greater than, less than, or equal to the load?