Perhaps every one has some knowledge of friction, which he gains through experience and/or science education. As a part of daily life, friction is as common as gravity. Many people think that, its thorough understanding must have been attained. The reality is nonetheless not so satisfactory. Here [1] is a piece of work attempting to resolve an issue concerning the onset of sliding under a force at the trailing of a slider, which rubs against a track.
The author set up a phenomenological model and solved it numerically. The interaction between the slider and the track is modeled by spring contacts, whose rupture and formation are governed by a simple law set by a threshold force. Their study showed that, the sliding is always preceded by crack-like fronts, which signifies the propagation of a broken contact.
[1]PRL, 103:194301(2009)
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