@oboe_learning: This is why height isn't just height, it's energy! Professor Walter Lewin demonstrates conservation of energy: the ball needs to be released from at least 2.5 times the radius of the loop above the bottom, or it simply doesn't have enough energy to make it around without falling off the track. That's energy changing form, height turning into speed, and it's exact math, not a guess. Credits to Professor Walter Lewin #physics #conservationofenergy #scienceexperiments #Science #howthingswork