Coupling between static friction force and torque

Details Coupling between static friction force and torque Coupling between static friction force and torque

2005-02-15

arxiv.org/abs/cond-mat/0502358v1

Phys. Rev. E 71, 066602 (2005)

Physics

Condensed Matter

Materials Science

6 pages, 4 figures, revtex

Scientific paper

10.1103/PhysRevE.71.066602

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 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.

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