  The microscopic origin of friction has been the goal of several theoretical
studies in the last decades. Depending on the investigated systems or models,
on the simulation techniques or conditions, different and somewhat
contradictory results have been found, even when using the same model. In this
contribution, we address this apparent paradox in a well-known case, the
Prandtl-Tomlinson model at zero temperature, studying the force-velocity
relation for a wide range of velocities not previously presented. Including
much more data density for the non trivial regions, we are able to shed light
on this problem and at the same time, provide new insight in the use of the
paradigmatic Tomlinson model for the secular problem of friction laws.
