题目内容
(9分)如图所示,光滑水平面上一质量为M、长为L的木板右端靠竖直墙壁。质量为m的小滑块(可视为质点)以水平速度v0滑上木板的左端,滑到木板的右端时速度恰好为零。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006215124328.jpg)
①求小滑块与木板间的摩擦力大小;
②现小滑块以某一速度v滑上木板的左端,滑到木板的右端时与竖直墙壁发生弹性碰撞,然后向左运动,刚好能够滑到木板左端而不从木板上落下,试求
的值。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006215124328.jpg)
①求小滑块与木板间的摩擦力大小;
②现小滑块以某一速度v滑上木板的左端,滑到木板的右端时与竖直墙壁发生弹性碰撞,然后向左运动,刚好能够滑到木板左端而不从木板上落下,试求
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000621527761.png)
见解析
试题分析:①小滑块以水平速度v0右滑时,有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000621543904.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000621559810.png)
②小滑块以速度v滑上木板到运动至碰墙时速度为v1,则有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000621574934.png)
滑块与墙碰后至向左运动到木板左端,此时滑块、木板的共同速度为v2,则有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000621590805.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006216051237.png)
上述四式联立,解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000621637926.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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