Provided two contact bodies are in the critical state of relative sliding, the tangential force is proportional to the vertical force.
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。
Do the tangential force, the mormal force, the resultant force and their directions during oscillation of a simple pendulum change?
那么单摆在振动过程中，切向力、法向力及合力的大小和方向是否在变化?。
Considering the tangential force applied on a contact spot, the critical area demarcating the elastic and plastic regimes is obtained by comparing the normal elastic load with the normal plastic load.
计及作用于接触斑点上的切向力，通过比较作用于接触斑点上的法向弹性载荷与法向塑性载荷，确定了区分弹性接触与塑性接触区域的临界接触斑点面积。
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