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The suppression of friction between sliding objects, modulated or enhanced bymechanical vibrations, is well established. However, the precise conditions ofoccurrence of these phenomena is not well understood. Here we address thesequestions focusing on a simple spring--block model, which is relevant toinvestigate friction both at the atomistic as well as the macroscopic scale.This allows to investigate the influence on friction of the properties of theexternal drive, of the geometry of the surfaces over which the block moves, andof the confining force. Via numerical simulations and a theoretical study ofthe equations of motion we identify the conditions under which friction issuppressed and/or recovered, and evidence the critical role played by surfacemodulations and by the properties of the confining force.

Solid-on-solid single block dynamics under mechanical vibration