功的原理是能量守恒定律的一种表现形式,它把力、简单机械和功联系起来。初中物理课本“功的原理”一节的教学中,既要为后面斜面的学习埋下伏笔,又要为机械效率的学习留有余地,而本节的教学又是建立在抽象的“功”的概念的基础上的,所以教学有一定难度。课本上对“功的原理”的描述采用了“物化”的语言:“利用任何机械时,人们所做的功,都等于不用机械而直接用手做的功”。在教学中如何发挥教材的这一特点,以取得教好的教学效果,是大家所共同关心的。一、我们的认识和做法 The principle of work is a manifestation of the law of conservation of energy, which relates force, simple mechanics, and work. Middle school physics textbook “The principle of work” section of the teaching, both for the study behind the bevels to lay a foundation, but also to leave room for the study of mechanical efficiency, but this section is based on the teaching of abstract “power” Based on the concept, so teaching has a certain degree of difficulty. The textual description of “principle of work” uses a “materialized” language: “When using any machine, the work done by men is equal to the work done directly by hand without the use of machinery.” How to give full play to the characteristics of teaching materials in teaching so as to obtain good teaching results is a common concern of all. First, our understanding and practice