题目

英语翻译
滑动摩擦力总是比最大静摩擦力要小.它由垂直于摩擦面的力FN和滑动摩擦系数µ决定,它与滑动面之间的相对速度和面积无关.摩擦系数由滑动面的物质、粗糙度和（可能存在的）润滑剂所决定.
可以用翻译工具,但拜托把翻译工具翻译出来的句子修改正确了再发给我,
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提问时间：2020-10-04

答案

Sliding friction force is always smaller than force of maximum static friction.It is decided by normal force FN and sliding friction coefficient µ,and has no reference to relative velocity and area between the sliding surfaces.Friction coefficient is determined by substance,roughness concentration and lubricant (may exist) of the sliding surfaces.
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