Mari Schuh 
Holding a Door Open [PDF ebook] 
Wedge vs. Wheels and Axles

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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.

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Language English ● Format PDF ● ISBN 9781467783033 ● Publisher Lerner Publishing Group ● Published 2015 ● Downloadable 3 times ● Currency EUR ● ID 5034071 ● Copy protection Adobe DRM
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