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功和机械能是初中力学知识的重要部分.正确理解功和机械能的概念.知道:力做功的条件,能区分功和能的概念,会:判断动能、势能间的相互转化,将有助于我们分析解决有关功和能的问题.易错点1:判断力是否做功物理学中.力对物体做功必须满足两个条件:一是有力作用在物体上,二是物体在力的方向上移动一段距离.这两个条件缺一不可.有些同学不清楚物体做功的条件,认为只要物体受力,且物体运动了一段距离,这个力
Power and mechanical energy are important parts of mechanics of junior high school. Correct understanding of the concepts of work and mechanical energy. Knowing: The conditions of work, the distinction between work and energy, will: Judge the mutual transformation of kinetic and potential energy, will help us Analysis and solve the problems related to work and energy Error-prone point 1: Judgment is to do power physics Physics efforts to do things must meet two conditions: First, a strong role in the object, and second, the object moves in the direction of a force Distance.The two conditions are indispensable.Some students do not know the conditions of the object doing work, that as long as the object is subject to force, and the object moves a distance, the force