Coaster designers then have to consider what happens after the first drop. The calculation between the lift hill and the drop heights have to be precise, otherwise the train will not gather enough potential and kinetic energy to complete the circuit. The kinetic energy at the bottom of the drop determines how far the coaster train can travel along the track and through inversions, banked turns and airtime hills. The coaster rails control the angle of descent meaning the steeper the first drop, the greater the kinetic energy. All objects falling to the ground seek the fastest way down which is typically straight down. The greater the potential energy in the train gathered during the lift hill climb, the more kinetic energy the train will have at the bottom of the drop. A transfer of Potential Energy to Kinetic Energy occurs when the coaster train leaves the top of the lift hill and powers down the first drop. When an object falls back to Earth, it gathers Kinetic Energy.
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