题目内容
如图所示,倾角
的等腰三角形斜面固定在水平面上,质量分别为2m和m的A、B 两个滑块用不可伸长的轻绳通过滑轮连接(不计滑轮质量和摩擦)。已知A滑块和左侧斜面的动摩擦因数
,B与右侧斜面间光滑接触。且A、B均处于静止状态,则A与斜面间的摩擦力
的大小和方向为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020171123042.png)
A.
,沿斜面向上
B.
,沿斜面向下
C.
,沿斜面向上
D.
,沿斜面向上
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017065480.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017080577.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017096364.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020171123042.png)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017127707.png)
B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017127707.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017158675.png)
D.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017174573.png)
A
试题分析: 沿斜面方向分析
以A为研究对象:2mgsin300=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017190364.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017205355.png)
以B为研究对象:mgsin300 =
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017190364.png)
解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017205355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002017252561.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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