Dresden 2003 – scientific programme

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DY: Dynamik und Statistische Physik

DY 43: Granular matter II

DY 43.5: Talk

Thursday, March 27, 2003, 12:15–12:30, G\"OR/229

Frictional coupling between sliding and spinning motion — •Zénó Farkas¹, Guido Bartels¹, Tamás Unger^1,2, and Dietrich E. Wolf¹ — ¹Inst. of Physics, Gerhard-Mercator University Duisburg, D-47048 Duisburg, Germany — ²Dept. of Theoretical Physics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary

We show that the friction force and torque, acting at a dry contact of two objects moving and rotating relative to each other, are inherently coupled. As a simple test system, a sliding and spinning disk on a horizontal flat surface is considered. We calculate, and also measure, how the disk is slowing down, and find that it always stops its sliding and spinning motion at the same moment. We discuss the impact of this coupling between friction force and torque on the physics of granular materials.