坐标轴正方向选取对力学问题求解的影响  

The influence ofcoordinate axis direction selection on the solving of mechanics problems

作　　者：马淑红[1] 王天兴[1] 焦照勇[1] 

机构地区：[1]河南师范大学物理与电子工程学院,河南新乡453007

出　　处：《高师理科学刊》2014年第3期62-65,共4页Journal of Science of Teachers＇College and University

摘　　要：在求解理论力学质点动力学问题时,因坐标系正方向的选取常常给学生带来许多困惑.通过两道典型习题,详细分析学生错解的原因,应用不同的符号法则给出正确的求解过程,对比总结出坐标系建立的一般方法及解题中关键问题.帮助学生澄清疑惑,提高规范严谨的解题能力.In theoretical physics, students encounter many difficulties when choosing different positive direction of coordinate system. By solving two basic particle dynamic problems discuss the wrong results commonly seen in students＇derivation and point out the problems needing more attention. And the correct results are given in more detail to illustrate the specification of choosing the direction of coordinate system. The usual method of coordinate system setting and the key points related are also summarized.

关 键 词：坐标轴正方向 矢量投影量 自然坐标系 切向坐标轴 曲率半径 

分 类 号：O313.1[理学—一般力学与力学基础]