Lower and Higher tracks of Roller Coster
Ride design with higher and lower tracks is crucial for increasing excitement. In the ride operations menu, making the ride time longer (by increasing the number of swings, turns, the time limit etc) increases the excitement rating.
From that point on, the roller coaster does two things with its energy. First, it begins to transform that energy from one form to another––from gravitational potential energy to kinetic energy and from kinetic energy to gravitational potential energy, back and forth.
Second, it begins to transfer some of its energy to its environment, mostly in the form of heat and sound. Each time the roller coaster goes downhill, its gravitational potential energy decreases and its kinetic energy increases. Each time the roller coaster goes uphill, its kinetic energy decreases and its gravitational potential energy increases. But each transfer of energy isn't complete because some of the energy is lost to heat and sound.
Because of this lost energy, the roller coaster can't return to its original height after coasting down hill. That's why each successive hill must be lower than the previous hill.
Eventually the roller coaster has lost so much of its original total energy that the ride must end. With so little total energy left, the roller coaster can't have much gravitational potential energy and must be much lower than the top of the first hill.