1. If a ball is attached to a string and is spun in a vertical circular motion of constant velocity, at which point in the trajectory is the string more likely to break? Why?
2. Bob and Sue are on skateboards facing each other. Bob weighs twice as much as Sue. Bob pushes Sue with a force F. Determine what will likely occur? (i.e. will Bob move, if yes what will his velocity be in comparison to Sue's velocity?)