摩擦因数和运动速度有关么？

作者：Helhes
链接：https://www.zhihu.com/question/22554470/answer/21861499
来源：知乎
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维基百科条目：Friction（请无视中文版，机翻的你有本事上谷歌你有本事开门啊！）

The elementary property of sliding (kinetic) friction were discovered by experiment in the 15th to 18th centuries and were expressed as three empirical laws:

• Amontons' First Law: The force of friction is directly proportional to the applied load.

• Amontons' Second Law: The force of friction is independent of the apparent area of contact.

• Coulomb's Law of Friction: Kinetic friction is independent of the sliding velocity.

即所谓滑动摩擦三定律：1.摩擦力与正压力成正比；2.摩擦力无关接触面积；3.摩擦力无关滑动速度。
——————————————（分割线是这么打的么）———————————————-—
不理想的状况下，比如摩擦生热改变了接触面性质——比如冰块摩擦表面融了一层水膜，就会减小摩擦力——但是，这是不是冰块自身的摩擦系数改变了？
如果非要说表面镀水膜的冰块还是冰块，并作为整体考虑，那摩擦系数就算是变了吧。