Forces and the process of zipping

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It's not as much about forces involved as it is about the principle of working of a zipper.
<br>A zipper consists of (now please pardon my lack of knowledge of correct English words for these things) 2 halves, usually made of cloth, with little metal or plastic things on then, lets call them teeth? and there is this sliding thing, lets call it a slider, which you move to zip or unzip. if you look ...