Holding a Door Open

ebook Wedge vs. Wheels and Axles · First Step Nonfiction — Simple Machines to the Rescue

By Mari Schuh

cover image of Holding a Door Open

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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 toy. This book supports engineering design standards for primary grades in the Next Generation Science Standards.
Holding a Door Open