力学教学中两个守恒定律的理解

Comprehension of two conservation laws in teaching of mechanics

从详细分析一道算题入手,针对学生学习中存在的问题阐明了对动量守恒定律和机械能守恒定律适用范围和条件的理解.

Starting with analysis of a calculating problem and focusing on the existing problems in studeut's studying, the article clarifies the applicable range and conditional comprehension of conservation laws of momentum and mechanic energy.