Holding a Door Open: Wedge vs. Wheels and Axles
Holding a Door Open: Wedge vs. Wheels and Axles
From the Series First Step Nonfiction — Simple Machines to the Rescue
Which makes it easier to lift a large toy—a wedge or wheels and axles? Readers will see how a group of kids compares two simple machines and decides which one does a better job at lifting the Read More →