动量守恒是高中物理教学的重点和难点,在一轮复习教学中教师为降低该部分知识的难度,常将常见物理情景归纳总结成若干模型,如两球碰撞模型、弹簧模型、子弹打木块模型、小球半圆型槽、绳牵连模型等.笔者在实际教学 Momentum conservation is the key and difficult point of high school physics teaching. In the reviewing teaching, to reduce the difficulty of this part of knowledge, teachers often summarize common physical scenarios into several models, such as two-ball collision model, spring model, Model, semicircular ball groove, rope implicated model, etc. The author in the actual teaching