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本题考查的知识点是:1.动量守恒定律及其适用条件;2.能的转化和守恒定律。本题考查学生的能力是:综合分析和把握复杂的物理过程的能力,包括将复杂的物理过程分解成几个简单的、学生熟悉的、相互间关联的物理过程的能力和寻找每个过程所遵循的物理规律,并能用数学的方法解决物理问题的能力。本题应涉及以下几个过程:过程1、B、C 碰撞结合成一个整体 D 的过程,在此过程中认为弹簧仍为原长,A 仍静止。此过程 B、C 系统的动量守恒,且 B、C有共同的末速度 v_1,而 B、C 系统的动能(机械能)有损失。过程2、从 D 开始压缩弹簧,A 在弹簧的作用下开始运动,一直到弹簧被压缩到最短,突然被锁定的瞬间。此过程 A、D 系统动量守恒,且 A、D 有共同的末速
The knowledge of this question is: 1. The law of conservation of momentum and its applicable conditions; 2. The transformation and conservation of energy. The ability to examine a student’s abilities in this problem is to comprehensively analyze and grasp the capabilities of complex physical processes, including the ability to break complex physical processes into several simple, familiar, interrelated physical processes and to follow each process The laws of physics, and the ability to use mathematical methods to solve physical problems. This question should involve the following processes: The process 1, the collision between the B and the C is combined into a whole D. In this process, the spring is still considered to be the original length, and A still stands still. In this process, the momentum of B and C systems is conserved, and B and C have a common end velocity v_1, while the kinetic energy (mechanical energy) of B and C systems is lost. Process 2, starting from D, compresses the spring and A starts to move under the action of the spring until the spring is compressed to the shortest and suddenly locked. In this process, the momentum of A and D systems is conserved, and A and D have the same final velocity.