题目内容
完全相同的两个三角形滑块
、
,按图所示方式叠放在水平面上。设
、
接触的斜面光滑,
与桌面的动摩擦因数为
,现在
上作用一水平推力
,恰好使
、
一起在桌面上匀速运动,
、
保持相对静止。则
与桌面的摩擦因数
跟斜面倾角
的关系为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241241542062178.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153863300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153894314.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153925303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153894314.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153863300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153972328.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153894314.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124154034306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153863300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153894314.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153863300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153894314.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153863300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124153972328.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124154190302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241241542062178.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
B
物体做匀速直线运动,以整体为研究对象可知A与桌面间的摩擦力
,对B有F=
,联立可知,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124154253703.png)
故选B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124154331714.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124154362610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124154253703.png)
故选B
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() | C.![]() | D.![]() ![]() |