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合力与分力的关系是等效替代关系,即合力与分力对某个物体的作用效果是完全相同的,正确理解和运用这种等效关系,可以顺利解决某些本来难以处理的问题.
The relationship between the resultant force and the component force is the equivalent substitution relationship, that is, the effect of the resultant force and component force on an object is exactly the same. Correct understanding and application of this equivalent relationship can successfully solve some problems that are otherwise difficult to handle.