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We propose an elasto-plastic inspired friction model which incorporatesinterfacial stiffness. Steady state sliding friction is characterized by ageneric nonmonotonic behavior, including both velocity weakening andstrengthening branches. In 1D and upon the application of sideway loading, wedemonstrate the existence of transient cracklike fronts whose velocity isindependent of sound speed, which we propose to be analogous to the recentlydiscovered slow interfacial rupture fronts. Most importantly, the properties ofthese transient inhomogeneously loaded fronts are determined by steady statefront solutions at the {\em minimum} of the sliding friction law, implying theexistence of a new velocity scale and a "forbidden gap" of rupture velocities.We highlight the role played by interfacial stiffness and supplement ouranalysis with 2D scaling arguments.

Cracklike Dynamics at the Onset of Frictional Sliding