How Do Zippers Work?

How Do Zippers Work?

By: Anna Capobianco

This image was selected as a picture of the we...
This image was selected as a picture of the week on the Czech Wikipedia for th week, 2007. (Photo credit: Wikipedia)

Zippers are built around a wedge and a hook. A wedge is an object with a slanted surface. A door stop is a good example of a wedge. When you put a wedge under a door, it applies an upward force on the bottom of the door. A hook is a curved piece of material that can be used to grab onto another piece of material. Hooks have been used as fastening devices for a very long time because they are simple and stable.