首先我们要区分碰撞和推动两种作用过程.两个做相对运动的物体,接触并迅速改变其运动状态的现象,叫做碰撞.所以发生碰撞要两个或多个物体有不同的速度并接触.如果两个物体接触时恰好共速,就不是碰撞,之后的运动也不叫碰撞,如果能继续相互作用一起运动,那就应该叫“推着走”.在物理习题中,经常会遇到区分碰撞与“推着走”的问题,“推着 First of all, we need to distinguish between the collision and the promotion of the two roles of the two objects to do relative movement, contact and quickly change its state of movement phenomenon, called collision. So collision occurs to two or more objects have different speeds and contact. If the two objects come into contact with each other at exactly the same speed, they are not collisions, and the subsequent motion is not collided. If they can continue to interact and interact with each other, they should be called ”push and go.“ In physical exercises, To distinguish between the collision and the ”push“ problem, ”push