Other editions of book Holding a Door Open: Wedge vs. Wheels and Axles

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.

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.

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