摘要
本文从变质量物体动力学方程以及由此推导出的变质量物体动能定理出发,分别结合质量增和减的两个实例,分析了教学中物理图像模糊的变质量问题.指明了对于同一个问题之所以能用质点的动力学方程又能用变质量物体动力学方程求解,根本原因在于从动力学角度看,变质量系统的质量可以看作"不变",因为所谓的"变"只是对某个研究对象而言,变质量系统的动力学方程就是质点系动量定理的一种表达形式.
Variable mass is one of the most puzzling problem in physics teaching process. In this article, the kinetic energy theorem of variable mass system from the dynamic equations of variable mass bodies was deduced and a detailed mass decrease was given. It is shown that invariable, And the variety of subject lea concluded that the dynamic equations of v explanation involving the problems of mass the mass of the system which is spoken as ds to the ＂variety＂ of mass as a matter increase and ＂variable＂ is of fact. It is ariable mass bodies are the applications of the theorm of
出处
《中央民族大学学报（自然科学版）》
2012年第4期11-14,共4页
Journal of Minzu University of China(Natural Sciences Edition)
基金
北京林业大学精品课程项目资助(No.2011-6-9)
关键词
变质量问题
质点动力学方程
变质量物体动力学方程
变质量物体动能定理
variable mass
the particle dynamic equations
the dynamic equations of variable massbodies ,the kinetic energy theorem of variable mass system
