Pulling by Pushing, Slip With Infinite Friction, and Perfectly Rough Surfaces

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Abstract
When one rigid object (the pusher) pushes another (the slider) across a horizontal support plane, Coulomb's law of friction admits some surprising phenomena. First, it is possible to move the slider by moving the pusher away from the slider: pulling. Second, even with an infinite coefficient of friction, it is possible to obtain slip between the two objects as the pusher moves into the slider. This contradicts the common conception that infinite friction always prevents slip. The per fectly rough contact of classical mechanics is not realized by an infinite coefficient of friction. This article shows examples of the phenomena with both quasistatic and dynamic analy ses.

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