what do coats, trousers, dresses, boots and bags have in common? they all have zippers. have you ever thought work?
zippers are made form two simple tools, One is a wedge. One is a hook . lf you push a wedge against something, lt pushes that to cloth side. A hook is a piece of cloth or metal that holds onto something else.
we use hooks on blouses and dresses. We can also find them on some boots. ln the old days,there were hooks on your shoes for shoelaces.
A zipper is made up of a track with dozens of hooks and a slide。 when you move the slide up the track, it fores the hooks together. your zipper is now unzipped. when you pull down the slide ,it forces the hooks apart. your zipper is now unzipped.
so next time you zip your jacket, think about how this little invention has made your life easier. lt is not even a hundred years old!
zippers are made form two simple tools, One is a wedge. One is a hook . lf you push a wedge against something, lt pushes that to cloth side. A hook is a piece of cloth or metal that holds onto something else.
we use hooks on blouses and dresses. We can also find them on some boots. ln the old days,there were hooks on your shoes for shoelaces.
A zipper is made up of a track with dozens of hooks and a slide。 when you move the slide up the track, it fores the hooks together. your zipper is now unzipped. when you pull down the slide ,it forces the hooks apart. your zipper is now unzipped.
so next time you zip your jacket, think about how this little invention has made your life easier. lt is not even a hundred years old!
