Farkas Zénó, Bartels Guido, Unger Tamás, Wolf Dietrich E
Institute of Physics, University Duisburg-Essen, D-47048 Duisburg, Germany.
Phys Rev Lett. 2003 Jun 20;90(24):248302. doi: 10.1103/PhysRevLett.90.248302. Epub 2003 Jun 18.
The tangential motion at the contact of two solid objects is studied. It consists of a sliding and a spinning degree of freedom (no rolling). We show that the friction force and torque 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 slows 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.
研究了两个固体物体接触处的切向运动。它由滑动和旋转自由度组成（无滚动）。我们表明摩擦力和扭矩本质上是耦合的。作为一个简单的测试系统，考虑一个在水平平面上滑动和旋转的圆盘。我们计算并测量了圆盘是如何减速的，发现它总是在同一时刻停止滑动和旋转运动。我们讨论了摩擦力和扭矩之间的这种耦合对颗粒材料物理性质的影响。
