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初中物理(人教版)杠杆一节教学中,“力臂”概念学生难以掌握,笔者以为主要原因是两个方面,一是学生不明白为什么引入力臂概念,二是教科书在安排学生研究杠杆平衡条件的实验中,设有对“力臂”变形情况加以实验直观探讨.针对这两个方面,采取如下做法:1.把“力臂”概念与学生原有的知识结构联系起来.教学时,通过推、拉教室门演示回顾力的作用效果相关的三要素:大小、方向、作用点,并对要素之一“力的方向”发挥引出力的作用线概
In the teaching of junior middle school physics (PEP) leverage, the concept of “arms” is difficult for students to grasp. The author believes that the main reasons are two aspects. One is that students do not understand why the concept of arm is introduced, and the other is that textbooks are used to arrange students. In the experiment of studying the conditions of lever balance, there is an intuitive study of the deformation of the “arm arm”. Based on these two aspects, the following practices are taken: 1. The concept of “arms” and the original knowledge of students The structure is linked. In teaching, the three elements related to the effect of force are reviewed by pushing and pulling the door of the classroom: size, direction, point of action, and the line of influence of one of the elements “force direction”