THE MUTUALITY OF STATIC AND KINETIC FRICTION.
WATERVLIET ARSENAL N Y BENET LABS
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An experiment was performed, the object of which was to observe directly the dependence of static friction force magnitudes upon the static contact time. Not only was there a complete lack of evidence that such a time-dependency exists, but in addition there were no static or starting friction forces which were observed to be greater than all the forces observed during subsequent sliding contact. A possible explanation for the contrary observations is given and is supported by results of a second experiment in which extensive sliding contact on a microscopic scale was observed prior to gross visible sliding. Author