The force is always perpendicular to the direction of motion.
因为这个力总是垂直,于运动的方向。
And the force is perpendicular to the arm.
力是垂直于杆。
RADIAL FORCE : The load on a bearing perpendicular to the axle, this and the Thrust load are forces that affect the design and application of bearings.
径向力：与轴承的轴线所垂直的载荷；它和轴向力是影响轴承设计和应用的两个力。
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