题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203165721486.gif)
一平板小车放在光滑水平面上,今有质量均为m的物体A和B分别以2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316603102.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316603102.gif)
(1)分析从 AB 滑上小车到与小车相对静止过程小车的运动情况(包括加速度、速度怎样变化及最后速度的大小和方向?)
(2)求此过程中 B 对地位移的大小和经过的时间?(物体 A、B 可视为质点且小车足够长使 AB 并不相碰)
(1)从AB滑上小车到B速度减为零,小车静止不动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316666895.gif)
直到与A相对静止 此过程动量守恒,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316681390.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316697467.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316712447.gif)
(1)从AB滑上小车到B速度减为零,小车静止不动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316666895.gif)
直到与A相对静止
此过程动量守恒,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316681390.gif)
方向向右
(2)此过程中B先向左位移为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120316978110.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120317024462.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120317118608.gif)
而后B与小车一起向右做匀加速运动.设此阶段B对地位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412031713499.gif)
所用时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120317149102.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203171962034.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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