Why is sliding friction greater than rolling friction?
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More force is needed to start a body moving across a surface than is needed to keep it in motion once started. Thus the coefficient of sliding friction for a pair of substances is greater than the coefficient of rolling friction.
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More force is needed to start a body moving across a surface than is needed to keep it in motion once started. Thus the coefficient of sliding friction for a pair of substances is greater than the coefficient of rolling friction.
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