Turn Gravity Off by Snapping the Cable

Einstein was struggling to understand how the force of gravity works. The legend goes that he found himself imagining a person riding in an elevator. And all of a sudden the cable gets cut and the elevator starts a plunge right down towards the earth. So Einstein said to himself, hang on a second. Here's an environment where in essence I can turn gravity off. Just as you can turngravity off by snapping the cable you can actually simulate gravity by pulling on the cable that pulls that elevator up really quickly.