题目内容
质量为M的斜面体A放在粗糙水平面上,用轻绳拴住质量为m的小球B置于斜面上,整个系统处于静止状态,已知斜面倾角及轻绳与竖直方向夹角均为
.不计小球与斜面间的摩擦,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326375353840.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132637488477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326375353840.jpg)
A.轻绳对小球的作用力大小为![]() |
B.斜面对小球的作用力大小为![]() |
C.斜面体对水平面的压力大小为![]() |
D.斜面体与水平面间的摩擦力大小为![]() |
AD
对小球受力分析,重力G、绳子拉力T、斜面支持力为N,绳与竖直方向夹角为
正交分解有,
,
,
,A正确、B错误;AB看作整体进行分析,有:
,
,C错误、D正确
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132637707297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132637816672.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132637863868.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132637894860.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326380191065.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132638050582.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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