【案例背景】本案例是物理苏科版第九章第一节《二力平衡》。本节的教学重点是通过实验探究,自行得到二力平衡的条件。平常教学时,笔者在实验探究环节一直以演示实验为主。简单,直观,教学效果也不错,弊端是师讲生听,师生互动少,课堂气氛一般。而这次正值笔者开《二力平衡》的区级公开课之际,开课班 [Case Background] This case is the first section of the Physics and Technology Division’s edition of the first edition of “The Balance of Two Forces.” The teaching of this section focuses on experimental exploration and self-balancing conditions. During normal teaching, the author has been mainly demonstrating experiments during the experimental exploration. It is simple and intuitive, and the teaching effect is also good. The disadvantages are that the teacher speaks students, the teacher-student interaction is small, and the classroom atmosphere is general. This is the time when the author opens the “Two Forces Balance” district-level open class.