Apple QuickTime movie | 2003-04-17 | 2.4 MB | 256x192 | 15fps | 1 minute, 11 seconds
Transcription: A roller coaster uses gravity and momentum to propel a string of cars called a train around a track that takes its riders up and down hills, around curves, and through loops. At the beginning of a ride, a typical roller coaster uses a motorized system called a chain lift to take the train to the top of the highest hill. Then gravity takes over, and the train plunges down the hill, reaching speeds of up to 70 miles per hour. A loop on a roller coaster is not circular. It has more of an upside-down raindrop shape. This shape applies a centripetal, or center-seeking force greater than the force o ...
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