A roller coaster is moved only
by the forces of inertia and gravity, for most of its travel. The only
exertion of energy occurs at the very beginning of the ride, when the
coaster train is pulled up the first hill (called the lift hill) with a
chain and motor (or other mechanical device) exerting a force on the
train of cars. Once the cars are lifted to the top of the hill, gravity
takes over and the remainder of the ride is an experience of the physics of energy transformation.
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