Holding a Door Open: Wedge vs. Wheels and Axles - Schuh, Mari C.
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"Is it easier to lift toys with a wheel and axle or a wedge? Readers will learn about how simple machines work in this book for early readers" --

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"Is it easier to lift toys with a wheel and axle or a wedge? Readers will learn about how simple machines work in this book for early readers" --