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两个质量相等的球,弹性正碰时由于动量守恒和机械能守恒,速度必相互交换,这是中学物理中经常要用到的一个重要结论。据此可知,一个速度为V的球与另一个静止的相同小球弹性正碰,原来运动的球会立即停止,而原来静止的球则以速度V运动。为了使学生对上述结论确信无疑,做好演示实验是十分必要的。目前一般采用图1所示的实验,演示效果常常不能令人满意。最近我发现不少小孩手里有一种新式小玩具一一碰碰球,于是也拿来试试。啊!这不是一个十分巧
Two balls of equal mass, when the spring is colliding with each other, will exchange speed with each other due to conservation of momentum and conservation of mechanical energy. This is an important conclusion often used in middle school physics. From this it can be seen that a ball of velocity V collides with another stationary same ball and the original moving ball stops immediately while the original stationary ball moves at speed V. In order to convince the students of the above conclusion, it is very necessary to carry out demonstration experiments. At present, the experiment shown in Figure 1 is generally adopted, and the demonstration effect is often unsatisfactory. Recently, I found that many children have a new type of small toys in the hands one by one touch the ball, so also used to try. Ah! This is not a very clever