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在求解涉及到滑动摩擦力的力的平衡问题时,可通过找正压力FN与摩擦力Ff的关系将四力平衡问题转化为三力平衡,然后再通过动态三角形找拉力F最小时的方向,简化做题过程.
When solving the balance of force involving sliding friction force, the four-force balance problem can be converted into three-force balance through the relationship between the correcting pressure FN and the friction force Ff, and then the direction of the minimum pulling force F is found through the dynamic triangle. Simplify the process of making questions.