Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 8 - Think and Explain: 85

Answer

See the diagram. A moving car cannot remain on a straight, super-icy track that is tilted, because the net force is sideways. The car must be rounding a curve, at just the right speed, so that the horizontal component of its normal force provides the required centripetal force to keep it moving in a curved path of that radius. Highway and racetrack designers bank the curves for this reason, with the expectation that drivers travel the curve within a fairly narrow range of speeds.
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