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动量守恒定律成立的条件:①系统受到的合外力为零;②系统所受的外力比相互作用力(内力)小很多以致可以忽略外力的影响;③系统在整体上不满足守恒条件,但在某一特定方向上满足以上两条。我们知道在现实生活中,不存在孤立的系统,即外界必然对系统有或多或少的影响,严格说来任何一个系统动量都不会守恒,但是我们仍然可以运用动量守恒定律来计算物体的运动状态。这个理想运动模型的建立就抓住了影响运动过程的主要因素
The conditions of the law of conservation of momentum are as follows: ① The system receives zero external force; ② The external force exerted on the system is much smaller than the interaction force (internal force) so that the influence of external forces can be ignored; ③ The system as a whole does not satisfy the conservation conditions, In a particular direction to meet the above two. We know that in real life, there is no isolated system, that is, the outside world necessarily has more or less influence on the system. Strictly speaking, any one system momentum will not be conserved, but we can still use the law of conservation of momentum to calculate the object’s Exercise status. The establishment of this ideal motion model captures the main factors affecting the movement process