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A roller coaster uses energy stored in the height of the cars. as the car falls lower, it picks up speed, as it gets higher, the speed falls away. With each loop and ramp, a little of the energy is lost due to friction and so the car will never be able to get back up to its original height. Therefore, the loops of the roller coaster will be built to be progressively lower throughout the ride, allowing the car to climb to the top of each ramp and still have enough kinetic energy to make it to the next downward slope.

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Q: Why do roller coasters have loops and hills?
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