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Physics do apply, so it helps to know a little bit about acceleration and centripetal force.
The Medusa, at New Jersey's Six Flags Great Adventure, is billed as the first floorless roller coaster. Riders sit in wheeled seats, with no floor, ceiling, or sides to detract from the sensation of flying. The transformation of humdrum Adventure World of Largo, Md., into Six Flags America comes complete with megacoaster Joker's Jinx, which rockets from zero to 63 mph in three seconds using electromagnetic motors. Identical twin Poltergeist debuts in San Antonio. Even sedate Dollywood in Pigeon Forge, Tenn., has added its first major coaster.