新课标将动量内容以选修的形式呈现,从而大大减少了对以系统为研究对象的多体问题的解答,而这类问题恰恰最能体现物理思想和方法,该类问题的缺失一方面降低了物理学习的难度,另一方面也制约了物理思维的进一步发展.对这类题目是不是不用动量知识解答就会更难更繁呢?答案是否定的!以“子弹打木块”模型为例,如果两个物体之间的相互作用力为恒力,比“动量+能量”简单的方 The new curriculum standard presents the content of the momentum as an elective, thus greatly reducing the answer to the multi-body problem that the system is the object of study. These kinds of problems can best represent the physical ideas and methods. The lack of such problems is reduced on the one hand The difficulty of learning physics, on the other hand also restricts the further development of physical thinking .This kind of topic is not without knowledge of momentum will be more difficult to do more? The answer is no! With “bullet playing block” For example, if the interaction between the two objects is a constant force, the model is simpler than the “momentum + energy”