The roller
coaster does not move at first until hauled to the top of an incline. The
roller coaster then accelerates and remains in motion for several rises and
falls, slows down and then accelerates again by gravity, but loses energy to
friction. As you're slowly going up the roller coaster, you start to feel heavier,
once you come to the top gravity begins to take you down. When you're going
down, there's more acceleration and you start to feel lighter because there are
more "g" forces being put on you. This can be proven by the rider
physically being lifted out of their seat when going downhill on a roller
coaster.
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