动量守恒是高考物理命题的重点,也是考生难点之一.动量守恒思想是物理学中极为重要的思想方法,是物理学研究的极高境界,是开启物理学大门的金钥匙,也是对考生进行方法教育和能力培养的重要方面.一、灵活选取研究对象选取研究对象是运用动量守恒定律解决问题的首要环节,选择的对象不同,计算的繁简程度不同,所以要合理选择研究对象.例1如图1所示,质量均为M的A、B两车,静止在光滑水平面上.A车上有一质量为m的人以速度 Momentum conservation is the focus of college entrance examination physics proposition, but also one of the difficult candidates.Motion conservation idea is an extremely important method in physics, is the ultimate state of physics research, is the golden key to open the door of physics, but also for candidates Method of education and ability to cultivate an important aspect.First, the flexibility to select the research object to select the research object is to use the principle of conservation of momentum to solve the problem of the first link, the choice of different objects, the calculation of the complexity of the different levels, so we should choose reasonable research objects. Shown in Figure 1, the quality of M’s A, B two cars, resting on a smooth horizontal surface .A car with a mass of m people at speed