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物体在受力平衡条件下,可以是静止的,也可以是匀速直线运动或匀速转动,还有的耪体虽然在运动中受力不平衡,但过程进行得很“缓慢”也可以认为运动中的每个状态是受力平衡的,这样就能够按受力平衡来处理。总的来看,物体受力平衡时,应该同时满足两个条件,一是合力为零,二是合力矩为零。而在不同的特殊条件下,又有一些各自具体的特点及规律,下面就对几种特例进行分析。
Under the conditions of force balance, the object may be stationary, or it may be a uniform linear motion or a uniform speed rotation. Although there are imbalances in the motion of the carcass, the process may be considered “slow” and it may be considered that Each state is balanced by forces so that it can be dealt with by force balance. In general, when the objects are balanced, they should satisfy two conditions at the same time. One is that the resultant force is zero, and the other is that the resultant moment is zero. Under different special conditions, there are also some specific characteristics and rules. The following will analyze several special cases.