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机械能变化的计算和判定在高考中出现频率较高,是教学中的重点和难点,笔者归纳总结如下:一、机械能损失的去向主要有三:1.转化为其它形式的能;2.克服阻力做功;3.由于碰撞而使机械能损失.
The calculation and determination of changes in mechanical energy have a high frequency in the college entrance examination and are the key and difficult points in teaching. The author summarizes the following points: First, there are three main directions for the loss of mechanical energy: 1. Conversion to other forms of energy; 2. Overcoming resistance to do work ; 3. Loss of mechanical energy due to collisions.