Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Explain: 79

Answer

This is discussed on pages 59-60. Friction depends on how hard the surfaces are pressed together. Lifting the opponent decreases the support force between him and the ground. This decreases the maximum frictional force the opponent can exert on the ground (and vice versa), hindering his ability to push off and move forward.
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