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

The terminal velocity means no more acceleration, so the forces of drag and weight must be equal, so the heavier would have the higher force of air resistance, this can look counter-intuitive because more dense objects get more speed in a non-vacuum environment and can led us to think they are experiencing less resistance, but the drag depends on the shape and speed, the denser object goes faster because they are heavier so needs more force to accelerate/brake.

The pedal, I thought was the right one because (looking from the right) you see the right foot moving in clockwise and the pedal turning free counter-clockwise on his axis/screw to keep flat to the foot, so my idea was that the friction could unscrew it. I went to check on my bike and it really was the left one, so I try to unscrew it and the crank set turned backward free. At the end with this design you can't unscrew without intentionally lock the crank set, if it was a regular screw you could just hit the break while unscrew.