1. The problem statement, all variables and given/known data Explain why the motion of someone jumping up and down on a trampoline is not simple harmonic motion. (Their feet lose contact with the trampoline during each bounce.) 2. The attempt at a solution I really can't think of anything. Maybe I haven't completely understood the concept of s.h.m. If someone could point me to a place where I could understand the whole thing. Thanks!