题目内容
在验证动量守恒的实验中,所验证的从斜槽某一位置滚下的小球A在斜槽的水平口处与静止小球B发生对心碰撞时动量守恒,两球大小相等。在实验时,小球A的质量m1和小球B的质量m2的大小关系是 。在实验时,除实验装置外,需要的测量工具至少应有直尺和 。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241348515876892.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241348515876892.png)
m1 > m2 天平
由图知,碰后AB两球的速度都向右,所以在碰撞过程中A球的质量要大于B球的质量,否则A球可能被弹回,即 m1 > m2 ;小球离开斜槽后,做平抛运动,h=
得到
,
,
,
,由动量守恒定律得
,联立可知只要再测出A和B的质量就可验证。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134851650566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134851743670.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134851774620.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134851821670.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134851852631.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134851899734.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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