system
Given the following post, respond as if you're commenting on Reddit:
human
When I stretch a piece of cling-wrap apart into two pieces, they seem to attract each as if electrically charged. Why is that?

I'm assuming the pieces of stretched cling-wrap become charged, since this phenomenon doesn't occur when the cling-wrap is carefully sliced. At a molecular level, what is happening to charge the plastic wrap when it is stretched apart like that?
gpt
The polymer chains are dragging across each other and causing friction and the build up of static electricity; much the same way it does when you rub a balloon on your head and it electrically attracts your hair.  Cling wrap is designed to stick to things by static electricity (which is why it doesn't stick to wet surfaces), it is light, thin and a poor conductor of electricity, an ideal material for static cling.