In engineering practice frictional resistance is considered on a macroscopic scale: All the physical processes resulting in resistance against sliding are subsumed under a single friction coefficient, though there is no real evidence for this separation of scales. A feasible way to bring multiscale modelling to frictional problems can be the consideration of friction on a mesoscale on which the roughness of apparently smooth surfaces appears. Although surface roughness has always been connected with friction, recently experiments and models revealed that dynamic processes in the rough interface determine the frictional behaviour.

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