逆向思维在力臂教学中的应用

The Application on Reverse Thinking in the Teaching of Force Arm

力臂概念是初中物理"杠杆"教学内容之一,如何对力臂概念进行有效建构,更好地为杠杆分类及探究平衡条件作铺垫,是很多初中物理教师一直在探讨的话题.通过对力臂测量仪教具的改进,采用让学生先进行杠杆平衡条件的实验探究,后归纳得出"力臂"概念,增强学生的理解,提高教学效果.

How to construct the concept of Arm of Force,one of the teaching contents of Lever for junior middle school,and how to better pave the way for the classification of Lever and the study of balance conditions,has been a major subject for many physics teachers in junior middle school.This article aims to enhance students’understanding and strengthen the teaching effect by improving the Arm of Force measurement instruments to enable students to conclude the concept of Lever through the experimental exploration of lever balance conditions.