题目内容
如图所示,重为G的物体静止在斜面上,当斜面的倾角θ逐渐增大时物体仍保持静止,下列分析正确的是
A.物体对斜面的压力增大 |
B.物体所受的静摩擦力增大 |
C.重力垂直于斜面的分力增大 |
D.重力平行于斜面的分力增大 |
![]() |
BD
对物体进行受力分析知:物体受重力G,支持力N和静摩擦力f。将重力分解为沿斜面的分力
,垂直于斜面的分力
,有
,
,由于保持静止,则物体处于平衡状态,则有f=
,N=
,故当θ逐渐增大时,
增大,D正确;f增大,B正确;
减小,C错误,N减小,则物体对斜面的压力也减小,所以A错误。故选BD。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009609380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009656426.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009687706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009719772.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009687706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009719772.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009687706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132009719772.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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