Roller coaster: the great fairground attraction

How they moveA Like a passenger train, a roller coaster consists of a series of connected cars that move on a track. But unlike a passenger train, it has no engine or power source of its own. For most of the ride, it is moved only by the forces of inertia and gravity. The only exertion of energy occurs at the very beginning of the ride when the coaster train is pulled up the lift hill. B The traditional lifting mechanism is a long length of chain running up the hill under the trac...