Why is a zipper a simple machine?
1 Answer
May 2, 2015
zipper is a simple machine because it is a wedge ...
a zipper is called a simple machine because it works by putting two inclined planes side by side so those inclined planes create a sharp edge there by forming a zipper.
A zipper has two lower wedges that permit it to close and a single upper wedge that allows it to open.
