人教版初中物理机械效率教学设计
以下是小编为大家准备的人教版初中物理机械效率教学设计,本文共13篇,希望对大家有帮助。 本节课由再探动滑轮的演示实验,引导学生分析计算两次做功的不同,从而引出有用功、额外功、总功的概念。再讨论:用水桶从井中提水的时候,所做的功哪部分是有用功,哪部分是额外功?如果桶掉到井里,从井里捞桶的时候,捞上的桶里带了一些水,这种情况下哪部分是有用功,哪部分是额外功?突破了对三种功的理解,既让学生巩固了基本概念
wp-content-crawler
domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init
action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /www/wwwroot/cuomi.com/wp-includes/functions.php on line 6121