摘要
在理论力学课程中,讨论动力学问题时经常会涉及到角量以及角量和线量的转换,常见的转换式有ds=ρdθ,xc=rθ等.在实际应用时,不同坐标轴正方向的选取会给转换式带来正负号的差别,若恰当选取坐标轴正方向,则可以简化计算,减少出错.
The conversion of angular quantity and linear quantity,such as ds=ρdθ,x_(c)=rθ etc,are often used in the course of theoretical mechanics.However,in the specific dynamics problem,the different selection of the coordinate axis′positive direction will bring different sign to the conversion formula.If the positive direction of coordinate axis is properly selected,the calculation can be simplified and errors can be reduced.
作者
秦岭
QIN Ling(College of Physics and Engineering,Chengdu Normal University,Chengdu 611130,China)
出处
《高师理科学刊》
2021年第10期89-92,共4页
Journal of Science of Teachers＇College and University
关键词
坐标轴正方向
理论力学
动力学问题
角量
the positive direction of coordinate axis
theoretical mechanics
dynamics problem
angular quantity
