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The nature of an instability that controls the transition from static todynamical friction is studied in the the context of an array of frictionaldisks that are pressed from above on a substrate. In this case the forces areall explicit and Newtonian dynamics can be employed without anyphenomenological assumptions. We show that an oscillatory instability that hadbeen discovered recently is responsible for the transition, allowing individualdisks to spontaneously reach the Coulomb limit and slide with dynamic friction.The transparency of the model allows a full understanding of the phenomenon,including the speeds of the waves that travel from the trailing to the leadingedge and vice versa.

Transition from Static to Dynamic Friction in an Array of Frictional Disks