What force is responsible for your socks sticking together after they have been in a clothes dryer?
The force is electrostatic attraction.........
Funnily enuff, I just put the washing on. Mind you, it's a sunny day here, so I am going to put my rags on the clothesline.
Anyway, when you tumble clothes in a dryer to dry them, they tend to build up a static charge. I presume electrons are passed between your items, leaving a slight electropositive charge on pieces of clothing, which will clump together with a piece of clothing that has a slight negative charge.
Laundry sheets, which may have an added fragrance, are readily available, and they tend to eliminate these charges, so that the dried clothes do not clump together.