从“轻”字入手——一次物理竞赛辅导课后记陈洪洲（江苏省盐城中学，２２４００１）通过一次竞赛辅导课，给学生留下了较深的印象，教学过程是这样的：课前，针对试题中常常出现轻绳、轻杆、轻质弹簧、轻质滑轮、轻质轮胎……这样的条件，笔者就以“轻”字所对应的物理模... Starting from the word “light” - A physics coaching class postscript Chen Hongzhou (Yancheng Middle School, Jiangsu Province, 224001) passed a competition tutoring class and left a deep impression on students. The teaching process is as follows: There are often light ropes, light poles, light springs, light weight pulleys, lightweight tires, etc... This condition, the author used the “light” character to correspond to the physical model...