题目内容
如图所示,小车的质量为
,后端放一质量为
的铁块,铁块与小车之间的动摩擦系数为
,它们一起以速度
沿光滑地面向右运动,小车与右侧的墙壁发生碰撞且无能量损失,设小车足够长,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241200078742599.jpg)
小题1:小车被弹回向左运动多远与铁块停止相对滑动?
小题2:铁块在小车上相对于小车滑动多远的距离?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007468327.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007718204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007734204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007734185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241200078742599.jpg)
小题1:小车被弹回向左运动多远与铁块停止相对滑动?
小题2:铁块在小车上相对于小车滑动多远的距离?
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007983778.gif)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007999748.gif)
小题1:
小车反弹后与物体组成一个系统满足动量守恒,规定小车反弹后的方向作向左为正方向,设共同速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120008014200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120008108637.gif)
解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120008124601.gif)
以车为对象,摩擦力始终做负功,设小车对地的位移为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120008280226.gif)
则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120008295805.gif)
即:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007983778.gif)
小题2:
系统损耗机械能为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120008482502.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241200084981040.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120007999748.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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