Can you solve these physics riddles? ft Simone Giertz - Part 1/3

Screw? Would have thought it was a bolt. Well, it would have something to do with becoming unscrewed because of a rotating surfaces. So maybe the left paddle so that paddling forward would only tighten it if anything.
Yes!
The heavier one, since the terminal velocity is higher and that means higher drag force. ~v^2