Center of mass travels down as object travels up

Two sets of ramps are available where an object (looking much like two kitchen funnels glued together) is placed on a track going uphill. Because the track widens the center of mass lowers at the same time that the object as a whole rolls uphill. One of the models has a ramp on both sides so the object can overshoot the maximum height and oscillate back and forth around that point. One is a one way trip where the object drops into a slot at the end.