The friction increases with the decrease in solid surface finish and tends to decrease with the increase in its surface hardness.
土壤摩擦力还随固体表面光洁度降低而增加，随表面硬度增加而趋于减小。
The effective friction coefficient is applied to the study of the oblique impact of a rigid sphere against a ductile solid.
此有效摩擦系数被应用于研究刚性球自由斜冲击延性靶问题。
The direct shear tests are more accurate in simulating friction behavior between blocks of solid waste feasible to determine the strength parameters of solid waste.
直接剪切试验更准确地模拟了垃圾团间的滑动摩擦特性，用直接剪切试验确定垃圾土的强度参数更合理；
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