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凡是相互作用的几个物体,就构成了系统模型。相互作用的模型有哪些基本规律?相互作用的模型实际上是力学模型。本文将力学模型归纳为以下七种:一、子弹打木块大木块放在水平光滑的桌面上,子弹以水平速度v_0打过来。碰撞时间极短,作用力相当大。内力远大于外力,碰后的状况有好多种,分别如下:(1)子弹打到木块,被木块弹回,没打进去,(2)子弹刚刚打进去,获得与木块相同的速度;(3)子弹打到木块里面一定深度,获得与木块相同的速度;(4)子弹刚要穿出木块的时候,与木块共速;
The interaction of several objects, constitute the system model. What are the basic rules of the interaction model? The interaction model is actually a mechanical model. In this paper, mechanical model can be summarized into the following seven kinds: First, the bullet hit wooden blocks on a smooth horizontal table, the bullet hits the horizontal speed v_0. Collision time is very short, a considerable force. The internal force is far greater than the external force, there are a variety of conditions after the collision, respectively, as follows: (1) bullets hit the block, was bouncing back, did not enter, (2) bullet just hit into, get the same speed ; (3) the bullet hits the wood block to a certain depth and obtains the same speed as the wood block; (4) when the bullet just needs to pierce the wood block, co-speed with the wood block;