Gradually dissipated by friction
As a roller coaster car travels up and down a trackway, its total mechanical energy is gradually dissipated by friction.
Explanation:
Its wheel are rubbing off against the trail as the rollercoaster travels up and down its track. Due to the friction between the wheels and the rail, some of the mechanical energy (sum of the potential and kinetic energy of the roller coaster) of the roller coaster is lost as heat energy which is dissipated due to the friction. This is why if you touch the wheels of the rollercoaster or rails of the track after a ride, they are usually warmer or hotter.
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