Gravity Illusion - Which Ball Falls First?

A fun and intriguing physics experiment that will have people second guessing themselves and eager to see the results of the race. An interesting educational tool to discuss scientific principles such as gravity, acceleration and velocityI. A classic example of the calculus of variations is to find the brachistochrone, defined as that smooth curve joining two points A and B (not underneath one another) along which a particle will slide from A to B under gravity in the fastest possible time.