Roseann Feldmann & Sally M Walker 
Screws [PDF ebook] 

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We”ve all seen screws, but how do they work? Why is it easier to screw something into something than to simply push it in? With basic hands-on experiments and clear descriptions, this simple machine is explained.

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Format PDF ● Pages 48 ● ISBN 9780822500667 ● Publisher Lerner Publishing Group ● Published 2001 ● Downloadable 3 times ● Currency EUR ● ID 4754238 ● Copy protection Adobe DRM
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