摘要
本文讨论了刚体定轴转动时动量矩J是否与角速度ω共线,匀角速度定轴转动是否就是合外力矩为零的惯性转动,定轴转动的动量矩守恒定律表达式是否能用来表述一般刚体转动的普适的动量矩守恒定律等易于误解的问题。最后从物理教学实践出发,对工科大学物理应如何编写及讲述这部分内容提出几点意见。
In this paper, we discussed the questions that easily cause mis-understanding in teachings such as. Whether the angular momentum J in turning rigid body about fixed axis is coaxial with angular velocity ω; whether uniform angular velocity turning about fixed axis is an inertial turning with zero resultant of external moments of force; whether the expression of law of conservation of the angular momentum in fixed axis turning can be used to express the universal law of conservation in the general turning of rigid body. Finally, from the point of physics teaching, we put forward a few proposals about how to compile and relate this content in teaching college physics.
关键词
动量矩
转动惯量
主轴
力矩
angular momentum
moment of inertia
principal axes moment of force
