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When you ride a roller coaster, you probably notice the chain / conveyor belt assembly that pulls the train of cars up the first big hill. What you may not know is that once that conveyor belt trip is over, the cars are powered by nothing but their own kinetic energy. Roller coasters were invented in Russia in the late 1880s and are a specialized type of railroad. The reason they can roll on their own kinetic energy is that the trip up that first hill raises the train’s potential energy.
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