when you stand on a trampoline, the surface depresses below equilibrium, and the surface pushes up on you, as the data for a real trampoline in (figure 1) show. the linear variation of the force as a function of distance means that we can model the restoring force as that of a spring. a 72 kg gymnast jumps on the trampoline. at the lowest point of his motion, he is 0.80 m below equilibrium.
