The momentum conservation and angular momentum conservation in the mechanics is difficult for students. The article analyzes the issues that bullet hits into the sticks and bullet hits into sandbags by using momentum conservation and angular momentum conservation, and compares them, and shows the practical application of the theory.%在力学中动量守恒和角动量守恒是学生容易出错的问题.本文分析了子弹击入木棒问题与子弹击入沙袋问题的区别,指出什么情况下系统的角动量守恒,什么情况下系统的动量守恒,从而说明了理论上的实际应用.
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