The maximum static friction force goes up with the relative humidity…
利用单峰接触的模型，建立了相对湿度与摩擦力关系的公式。
From the common mechanical phenomenon, present a theoretical method on how to judge the direction of static friction force.
本文以常见的力学现象为例，从理论上阐述判断静摩擦力方向的方法及作功问题的证明方法。
The dependence of the static friction force on a rod immersed in granular matter on the filling height of granules and the diameter of the rod is studied experimentally.
通过实验研究了圆棒在颗粒物质中受到的摩擦力与颗粒填充高度及棒径的关系。
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