题目内容
如图,斜面固定在地面上,两个质量相同的小物块A、B沿斜面匀速下滑(AB始终紧挨着),A、B间接触面光滑,已知A与斜面间的动摩擦因数是B与斜面间动摩擦因数的2倍, 斜面倾角为α,则B与斜面之间的动摩擦因数是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241501467401957.jpg)
A.
B.
C.
D.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150147582415.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241501467401957.jpg)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150146849626.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150146911613.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150147098440.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150147582415.png)
A、
试题分析:对AB整体进行研究,分析受力情况,作出力图,根据平衡条件列方程求解.
设每个物体的质量为m,B与斜面之间动摩擦因数为μ.以AB整体为研究对象.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241501479882923.jpg)
根据平衡条件得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241501482061022.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150148393735.png)
点评:研究对象也可以采用隔离法研究,要注意斜面对两个物体的支持力相等.
![](http://thumb2018.1010pic.com/images/loading.gif)
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