题目内容
如图所示,倾角为q的斜面上固定有一竖直挡板,重为G的光滑小球静止时,挡板对球的弹力大小为FN1,斜面对球的弹力大小为FN2,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241304405811207.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241304405811207.png)
A.FN1=Gtanq | B.FN1=Gsinq |
C.FN2=Gcosq | D.FN2=Gsinq |
A
挡板对球的弹力大小为FN1=Gtanq,A对,B错
斜面对球的弹力大小为
,CD错
斜面对球的弹力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130440612821.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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