圆周力---在平面上，作用点在圆周上，作用线与圆相切的线性力。
径向位移必须伴有圆周力。
The radial displacement must be accompanied by a circumferential force.
分析认为，锯切方向直接影响着管壁的受力状态，锯片与管子的接触弧长和锯切圆周力成正比关系。
The saw cutting direction directly affects the pressed wall thickness, the contacting arc length between saw disc and pipe has direct ratio to the cutting circumference force through analysis.
看过一简单、快速的演示圆周运动中力和加速度的变化吗？
Looking for a simple, quick demonstration of forces and acceleration in circle motion?
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