Physics & How Things Work

How a Zipper Zips

Name: How a Zipper Zips
Duration: 72 s
Description: A tiny brass Y inside the slider forces teeth into each other at exactly the right angle. Geometry, not magic.

A tiny brass Y inside the slider forces teeth into each other at exactly the right angle. Geometry, not magic.

You pull a tiny piece. The whole thing zips. How does ONE little slider close fifty pieces of metal at once?

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