All, A friend of mine recently posed the following riddle: You weight 198 lbs, and need to transport three iron balls that weight 1 lb each across a bridge that can only support 200 lbs. How do you do it? The proposed answer: Juggle the balls. It would seem to me that tossing a 1 lb ball in the air high enough to juggle it would exert more than 2 lbs of downward pressure. What do you think? What would be the relevant equation? Thanks!