Holding a Door Open
ebook ∣ Wedge vs. Wheels and Axles · First Step Nonfiction — Simple Machines to the Rescue
By Mari Schuh
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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.