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The friction that exists between surfaces when at least one of those surfaces is moving relative to the other.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
The friction that exists between surfaces when at least one of those surfaces is moving relative to the other.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
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==References==
==References==