题目内容
如图所示,物体在水平力作用下,静止在斜面上.若稍许减小水平推力
,而物体仍保持静止,设斜面对物体的静摩擦力为
,物体所受的支持力为
,则 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039024982391.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902451302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902466304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902482411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039024982391.jpg)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
B
试题分析:物体受重力、支持力、推力及摩擦力而处于平衡状态;受力分析及正交分解如图所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500390265411452.png)
在y轴方向上,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902685875.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902451302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902482411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902732804.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |