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82问答网 > 理论力学，请问一下确定合力作用点c的式子是怎么推导出来的，不知道怎么根据合力矩定理推

理论力学，请问一下确定合力作用点c的式子是怎么推导出来的，不知道怎么根据合力矩定理推

2025-04-07 07:05:01

推荐回答（1个）

回答1：

Fr为合力；
以A为旋转点，合力矩定理：AC*Fr=0*F1+AB*F2，即Fr/AB=F2/AC；
以B为旋转点，合力矩定理：BC*Fr=0*F2+AB*F1，即Fr/AB=F1/BC ;
所以F1/BC=F2/AC=Fr/AB

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