pdf file Screws (Early Bird Physics) (Early Bird Physics Series)



isbn:0822522160
Title:Screws (Early Bird Physics) (Early Bird Physics Series)
Author:Sally M. Walker

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.click here to download
 
 

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