I told you that the friction coefficient is independent of the mass of the object.
我讲过，摩擦系数，与物体质量无关。
The coefficient of friction for that same tire in mud would be almost zero.
同样的轮胎在泥泞的地面上，其摩擦系数可能几乎为零。
How much is the coefficient of friction between the tire and ground?
轮胎与地面间的摩擦系数是多少呢？
How much is the coefficient of friction between the tire and ground?
轮胎与地面间的摩擦系数是多少呢？
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