关于角动量的教学探讨

Discussion about the Teaching of Angular Momentum

提出了一种讲授角动量的新思路,通过将描述刚体转动的物理量与描述质点运动的物理量类比引入刚体角动量;通过转动定律推导出角动量定理,阐释刚体角动量概念引入的合理性和意义;再利用刚体角动量表达式推导出一般质点和质点系的角动量,体现角动量概念的普适性.

A new idea of teaching angular momentum was proposed. Angular momentum of a rigid body was introduced by a comparison between physical quantities for describing rotation of a rigid body and physical quantities for describing motion of a mass point. The authenticity and physical meaning of the concept of angular momentum of a rigid body was interpreted by a discussion of the relationship between angular momentum theorem and the law of rotation. And the angular momentum of a mass point and the angular momentum of a system of mass points were derived from the expression of angular momentum of a rigid body, which vividly reflected the universality of the concept of angular momentum.