两物体发生的对心碰撞,可能是完全弹性碰撞,或者是非完全弹性碰撞,抑或是完全非弹性碰撞。区分碰撞类型,可以采用二次函数法,作出碰撞后系统的动能与速度函数图象,形象地进行分析与区分,清新地解决碰撞后两物体速度可能的取值范围,明了地解释完全弹性碰撞后系统动能不变、完全非弹性碰撞后系统动能损失最大等问题。 Collision between two objects may be completely elastic collision, or not completely elastic collision, or completely inelastic collision. Differentiate the type of collision, you can use the quadratic function method to make kinetic energy and velocity function image of the system after the collision, the image analysis and differentiation, freshly solve the possible range of the velocity of the two objects after collision, a clear explanation of complete elastic collision The kinetic energy of the system remains unchanged, and the kinetic energy loss of the system after the complete inelastic collision is the largest.