How do zippers work?
** Lego zipper
Someone explain how they unzip
How do they unzip?
When you are chopping vegetables or splitting a log of wood, this is basically what is happening ( I leave you to do the FBD on this for more clarity )
The wedge (axe or a knife) not only slices through the object but also exerts a perpendicular force that pushes it outward.
This is exactly what happens while unzipping as well. A wedge is placed on the zipper that splits the two rows of interlocked teeth.
Pretty cool right ?