题目内容
如图所示,一光滑小球静止放置在光滑半球面的底端,用竖直放置的光滑挡板水平向右缓慢地推动小球,则在小球运动的过程中(该过程小球未脱离球面),木板对小球的推力F1、半球面对小球的支持力F2的变化情况正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045354621857.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045354621857.png)
A.F1增大,F2减小 | B.F1减小,F2减小 |
C.F1增大,F2增大 | D.F1减小,F2增大 |
C
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045354783200.jpg)
试题分析:据题意,当小球在竖直挡板作用下缓慢向右移动,受力情况如上图所示,移动过程中球面对小球作用力逆时针旋转,与竖直方向夹角增大,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004535494297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004535509648.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004535540723.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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