假设当两个接触面处于相对滑动的临界状态时，切向力与垂向力成正比。
Provided two contact bodies are in the critical state of relative sliding, the tangential force is proportional to the vertical force.
阻尼器经过几年的运行以后，阻尼器内部的液压介质、密封件也会发生不同程度的老化，相对滑动的零件之间也会产生不同程度的磨损；
After several years' operation, hydraulic medium and sealing elements inside the damper also have different degrees of aging, and abrasion is also caused among relative sliding parts;
而保证一个平面沿着另一个平面相对移动的力称为滑动摩擦力。
The force which must be overcome to keep one surface moving over another in known as sliding friction.
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