Lets say I have an inclined plane and I roll a solid cylinder down it and slide a brick down it. And lets say I slide the brick down on oil,Or better yet I slide a superconductor down and have It float above bar magnets. The superconductor moving down the plane will always beat the cylinder. We let them go from rest. Is this because some of the Gravitational potential energy goes into rotating the cylinder and not just sliding it down the ramp.