Screws seen pretty intuitive untill you actually start thinking about how they work. How come this tiny ridge along their edge can pull pieces of wood together with pretty amazing force?
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Metals have the trait of being ever so slightly elastic. When you tighten a screw/bolt, but you’re actually doing is putting the shaft of the screw into tension and slightly deforming it, which pulls together the two ends. Ever tighten a bolt too tight and all the sudden it becomes easier to turn? That’s because you put so much tension on the bolt that it deformed and stretched out a bit.
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