Why do riders experience high g-forces on pendulum rides?
As riders pass through the bottom of the circular arc, they often experience high g-forces. Once again, these g-forces are not evidence of increasing forces of gravitation, but the result of increases in the amount of force applied by the seat upon their bodies. Understanding this demands a little information about circular motion. The motion of an object in a circle requires that there be a force directed toward the center of the circle (sometimes called a “centripetal force”). This means that at the bottom of the circular swing, there must be an upward force (since the circle’s center is upward). Gravitational forces are always directed downward upon a rider’s body; thus, gravitational forces cannot meet this centripetal force requirement. The seat must supply the centripetal force, pushing upwards on the rider with a force greater than gravity’s downward pull. For a 180-pound person, the seat might have to supply 360 pounds of upward pull. This is twice the usual amount experienced
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