把握概念 自主探究 重视运用——机械能与内能学法指导

• 作 者: 徐海兰
• 出 处: 考试(中考版)
• 发表日期: 2004年期
• 关键词: 学法指导 重力势 压缩量 弹性势能 工作循环 控制变量 兴趣小组 变量法 探究过程 物理老师

一、把握概念1.正确理解功与能的关系我们知道物体具有能量的大小可通过能够做功的多少来衡量.在理解功与能关系时需要注意下列两点:(1)具有能的物体,不一定都处在做功的过程中.如:悬挂着的钢球,它虽没有做功,但它具有重力势能.(2)做功的过程,一定伴随着能量的变化.如飞行的子弹穿越鸡蛋的过程中,子弹对鸡蛋做了功,子弹的能量就会减小,子弹做了多少功,就减少多少能量.

First, grasp the concept 1. Correct understanding of the relationship between power and energy We know that the size of the object with energy can be measured by how much work can be done in understanding the relationship between work and energy need to pay attention to the following two points: (1) with energy objects, Not necessarily in the process of doing work, such as: suspended ball, although it does not work, but it has the potential for gravity. (2) the process of doing power must be accompanied by changes in energy such as flying bullets across the eggs During the process, the bullets do the work on the eggs, the energy of the bullets will be reduced, how much work the bullets did, and how much energy will be reduced.