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第一阶段滑动摩擦力(1)定义:两个互相接触的物体,当它们已经发生相对运动时。就会在接触面上产生一种阻碍相对运动的力,这种力就叫做摩擦力。(2)产生条件:第一,物体间相互接触、挤压,第二,接触面不光滑。第三,物体间有相对运动在这三个条件中物体间有相对运动。是一个难点,如何突破这个难点呢?我认为在判断两物体间有无相对运动时:第一,要选接触面为参照物。第二,看物体相对接触面往那个方向运动,这个运动方向就是我们要找的物体间的相对运动。
The first stage of sliding friction (1) Definition: two objects in contact with each other, when they have been relative movement. It will produce a force hindering the relative movement of the contact surface, this force is called friction. (2) Conditions: First, the objects contact with each other, squeezing, and second, the contact surface is not smooth. Third, the relative movement between objects in these three conditions, there is relative movement between objects. Is a difficult point, how to break through this difficulty? I think in determining whether the relative movement between two objects: First, to select the contact surface as a reference. Second, look at the relative contact surface to the direction of movement, the direction of this movement is that we are looking for the relative movement between objects.