题目内容
如图,在固定斜面上的一物块受到一外力F的作用,F平行于斜面向上。若物块质量为6千克,斜面倾角为370,动摩擦因数为0.5,物块在斜面上保持静止,已知最大静摩擦力等于滑动摩擦力,取g=10m/s2,cos37°=0.8,sin37°=0.6,则F的可能值为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242356253102697.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242356253102697.jpg)
A.10N | B.20N | C.0N | D.62N |
B
试题分析:物体受力分析如图
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242356254356413.jpg)
正交分解后我们可以看到,垂直斜面方向两个力,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235625872878.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235626480792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235627931304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235629210758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235626480792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235627931304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235626480792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235629210758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235636105806.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235637353744.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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