论文部分内容阅读
一、确立课标三维目标①知道静摩擦力产生的条件,会判断静摩擦力的方向,知道最大静摩擦力的概念.②知道滑动擦摩力产生的条件,会判断滑动摩擦力的方向,知道滑动摩擦力的大小跟什么有关,知道滑动静摩擦力跟压力成正比.二、基本概念解读(1)定义:两个相互接触而保持相对静止的物体,当它们之间存在相对运动趋势而没有相对运动时,在它们的接触面上会产生阻碍物体间相对运动趋势的力,这种力叫做静摩擦力.对定义中关键词的理解①“相对静止”有两层含义:一是两个物体都静止,二是两个物体都做速度相同的运动,其中速度相同的运动
First, to establish the three-dimensional goal of the standard curriculum ① know the conditions of static friction, will determine the direction of static friction, to know the concept of maximum static friction. ② Know sliding sliding friction generated conditions will determine the direction of sliding friction, sliding friction Second, the basic concept of interpretation (1) Definition: two mutual contact while maintaining relatively static objects, when there is a relative movement between them and there is no relative movement of the relative movement , The force at their contact surfaces will obstruct the tendency of relative motion between objects, which is called static friction. The understanding of the key words in the definition ① “Relatively still” has two meanings: one is that both objects Still, the second is that both objects do the same speed movement, of which the same speed movement