题目内容
如图所示,倾角θ=30°的斜面上有一重为G的物体,在与斜面底边平行的水平推力作用下沿斜面上的虚线匀速运动,若图中φ=45°,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415024288412094.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415024288412094.png)
A.物体一定沿虚线向下运动 |
B.物体一定沿虚线向上运动 |
C.物体与斜面间的动摩擦因数μ=0 |
D.物体与斜面间的动摩擦因数![]() |
AD
试题分析:物体匀速运动合外力为零, 则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241502430871172.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150243165497.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150243227673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150243274982.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150243337927.png)
故选AD
点评:中等难度。由受力情况得出物体的运动方向是解题的关键。
![](http://thumb2018.1010pic.com/images/loading.gif)
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