Conceptual Physics (12th Edition)

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

Chapter 14 - Think and Explain: 50

Answer

The tires heat up by friction and flexing. The gas molecules inside the tire have this heat transmitted to them. They move faster and hit the inside of the tire walls more frequently and with greater average energy, increasing the pressure.
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