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简单机械和功这一章在初中物理中既是中考命题的重点,也是同学平时学习过程中的难点,这就决定了教师要花更多的时间和精力在本章的教学上。本章可以由三大块知识点(简单机械、功和功率、机械效率)组成。本文对以上的知识点逐一细致分析。简单机械里主要讲了杠杆和滑轮一、杠杆明确杠杆是一个可以绕着固定点转动的硬棒。其外形可以是直的,可以方的,也可以是圆的,形状多样,但是在受到外力作用时候不能发生形变。弄清杠杆的五个要素,会找力的作用线。通过多次实
Simple mechanics and power in this chapter in junior high school physics is not only the focus of the thesis, but also students in the process of learning the usual difficulties, which determines the teacher to spend more time and energy in this chapter teaching. This chapter can be composed of three blocks of knowledge (simple mechanics, work and power, mechanical efficiency). This article analyzes the above knowledge points one by one. Simple machine mainly talked about the lever and pulley, the lever is a clear lever can be rotated around a fixed point of the hard rod. Its shape can be straight, can be square, it can be round, diverse shapes, but when subjected to external forces can not be deformed. Understand the five elements of leverage will find the role of force line. Through many real