题目内容
如图所示,质量为m,横截面为直角三角形的物块ABC,
,
AB边靠在竖直墙面上,物块与墙面间的动摩擦因数为
。F是垂直于斜面BC的推力,物块沿墙面匀速下滑,则摩擦力的大小为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241220371412151.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122036985348.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412203710972.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122037125204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241220371412151.jpg)
A.![]() | B.![]() |
C.![]() | D.![]() |
AD
物块ABC受到重力、墙的支持力、摩擦力及推力四个力作用而平衡,由平衡条件不难得出摩擦力大小为
,
。正确答案为AD
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122037406550.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122037421579.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() |
C.![]() | D.![]() |