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力臂概念的建构一直是初中物理教学的难点之一,但力臂又非常重要,它既是杠杆分类的依据之一,也是探究杠杆平衡条件的基础,所以如何突破难点有效建构力臂概念是初中物理教师经常探讨的话题.本文通过创新教具的制作,对突破“力臂”概念教学难点进行了几种实践和尝试.
The construction of the arm concept has always been one of the difficulties in junior high school physics teaching. However, the arm of arm is very important. It is not only the basis of lever classification but also the basis of probing the lever balance condition. So how to break through the difficulty? Physics teachers often discuss the topic.This article through the creation of innovative teaching aids, to break through the “arm” concept of teaching several difficult practices and attempts.