题目内容
如图所示,把光滑斜面上物体的重力mg分解为F1、F2两个力,(斜面倾角为θ)下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082416222510414687.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082416222510414687.png)
A.F1是斜面作用在物体上使物体下滑的力, F2是物体对斜面的压力 |
B.物体受到mg、FN、F1、F2四个力的作用 |
C.物体受到的合力为![]() |
D.力FN、F1、F2三个力的作用效果和mg与FN两个力的作用效果相同 |
CD
试题分析:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162225665333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162226149353.png)
物体受重力和支持力两个力.合力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162225353635.png)
力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162226929491.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162226149353.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162227444614.png)
故选CD
点评:解决本题的关键知道
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162227756421.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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