Physics is often taught in dry equations but Walter Lewin turns it into an edge of your seat thriller. He proves that the laws of nature are not just suggestions they are absolute. By releasing the ball from exactly 2.5 times the radius of the loop (h = 5/2 R) he demonstrates the perfect balance between gravitational potential energy and the kinetic energy required to maintain centripetal force. Watch as the math comes to life and the ball defies gravity through pure conservation of mechanical e

@sciencegirl Walter Lewin has to be one of the most engaging physicists known to us. Here he explains the conservation of energy through an experiment.