Gravity is the driving force of a roller coaster. The train is pulled to the top by gaining potential, or stored energy. As the train is pulled to the top, the train is released from the top of the lift hill; it is the acceleration due to gravity that brings it back to the beginning, its velocity increases. This causes the train to gain kinetic energy, which is the energy of motion. The faster the train moves, the more kinetic energy the train gains. The train begins to climb the next hill and the speed start to decreases.
The initial hill is the steepest in the entire ride.
Behemoth is my favorite roller coaster, it clear shows the gravity and potential energy and also velocity and kinetic energy.
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