Dahmen, Silvio R.; Farkas, Zeno; Hinrichsen, Haye; Wolf, Dietrich:
Macroscopic diagnostics of microscopic friction phenomena
2005
In: Physical review : E, Jg. 71 (2005), Heft 6, S. 066602 (5 Seiten)
Artikel/Aufsatz in Zeitschrift2005Physik
Titel:
Macroscopic diagnostics of microscopic friction phenomena
Autor(in):
Dahmen, Silvio R.; Farkas, Zeno; Hinrichsen, Haye; Wolf, DietrichLSF
Erscheinungsjahr
2005
DOI:
Erschienen in:
Titel:
Physical review : E
in:
Jg. 71 (2005), Heft 6, S. 066602 (5 Seiten)
ISSN:
ISSN:
Signatur der UB

Abstract:

We show that the static friction force which must be overcome to render a sticking contact sliding is reduced if an external torque is also exerted. As a test system we study a planar disk lying on a horizontal flat surface. We perform experiments and compare with analytical results to find that the coupling between static friction force and torque is nontrivial: It is not determined by the Coulomb friction laws alone, instead it depends on the microscopic details of friction. Hence, we conclude that the macroscopic experiment presented here reveals details about the microscopic processes lying behind friction.