动量守恒定律是高中物理教学重、难点之一,学生在应用动量守恒定律处理问题的过程中,往往感到难以下手或乱中出错,究其原因?原因之一就是学生建立物理模型的能力较弱,找不着依赖关系。物理研究往往应从建立模型入手,从基本模型的规律推广到复杂模型和实际应用中,才能有效的打开 The law of conservation of momentum is one of the most difficult and difficult points in high school physics teaching. Students often find it hard to start or chaos in the process of applying the law of conservation of momentum. One of the reasons is that students have a weak ability to establish physical models , Can not find the dependency. Physical research should start from the establishment of the model, from the basic model of the law to the complex model and practical application, can effectively open