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由于物质世界存在某些对称性,使得物理学理论也具有相应的对称性,从而使对称现象普遍存在于各种物理现象和物理规律中.应用这种对称性它不仅能帮助我们认识和探索物质世界的某些基本规律,而且也能帮助我们去求解某些具体的物理问题,这种思维方法在物理学中称为对称法.利用对称法分析解决物理问题,可以避免复杂的数学演算和推导,直接抓住问题的实质,出奇制胜,快速简便地求解问题.例1.沿水平方向向一堵竖直光滑的墙壁抛出一个弹性小球A,抛出点离水平地面的高度为h,距离墙壁的水平距离为s,小球与墙壁发生弹性碰撞后,落在水平地面上,落地点距墙壁的水平距离为2s,如图1所示.求小球抛出时的初速度
Due to the existence of some symmetry in the material world, the theory of physics also has the corresponding symmetry, so that the phenomenon of symmetry is ubiquitous in various physical phenomena and laws of physics.Using this symmetry can not only help us to understand and explore the matter Some basic laws of the world, but also help us to solve some specific physical problems, this method of thinking is called symmetry in physics.Using symmetry analysis to solve physical problems can avoid complex mathematical calculus and derivation , Directly grasp the essence of the problem, surprisingly winning, quick and easy solution to the problem.Example 1.A horizontal direction to a vertical wall throws a flexible ball A, the height of the thrown point from the level of the ground h, The horizontal distance of the wall s, ball and the wall after the elastic collision, falling on the level of the ground, landing from the wall horizontal distance of 2s, as shown in Figure 1. Find the initial velocity when the ball thrown