Friction weakening by mechanical vibrations: A velocity-controlled process V. Vidal, C. Oliver, H. Lastakowski, G. Varas and J. -C. Géminard Eur. Phys. J. E, 42 7 (2019) 91 Published online: 18 July 2019 DOI: 10.1140/epje/i2019-11855-2