题目内容
光滑水平面上放着一质量为M的槽,槽与水平面相切且光滑,如图所示,一质量为
的小球以速度
向槽运动,若开始时槽固定不动,求小球上升的高度(槽足够高);若槽不固定,则小球又上升多高?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331315021955.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131424337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131471325.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331315021955.jpg)
①
② ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331315961065.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131533708.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331315961065.png)
若槽固定:小球在运动过程中机械能守恒,设小球上升高度为
,则:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131705857.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131736701.png)
若槽不固定,设小球上升![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131814361.png)
槽与小球共同运动速度![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131861265.png)
由水平动量守恒得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131908783.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131939767.png)
小球和槽组成的系统机械能守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331320332058.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131658345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131705857.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131736701.png)
若槽不固定,设小球上升
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131814361.png)
槽与小球共同运动速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131861265.png)
由水平动量守恒得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131908783.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133131939767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331319701214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331320332058.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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