题目内容
如图所示,质量为m的物块在水平推力作用下,静止在倾角为θ的光滑斜面上,则物块对斜面的压力为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241622283172239.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241622283172239.jpg)
A.mgcosθ | B.mgsinθ |
C.mg/cosθ | D.mg/sinθ |
C
试题分析:以物块为研究对象,分析受力:重力mg、水平推力F和斜面的支持力N,由平衡条件得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162228349807.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162228629884.png)
故选C
点评:本题是三力平衡问题,是常见的陈题,分析受力,作出力图是关键.
![](http://thumb2018.1010pic.com/images/loading.gif)
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