题目内容
如图所示,两完全相同、质量均为m的光滑球A、B,放在竖直挡板和倾角为
的斜面间处于静止,则下列说法错误的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053113895946.png)
A.两球对斜面的压力大小相等
B.斜面对A球的弹力大小为![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311404595.png)
C.斜面对B球的弹力大小为![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311420914.png)
D.B球对A球的弹力大小为![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311436598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311358310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053113895946.png)
A.两球对斜面的压力大小相等
B.斜面对A球的弹力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311404595.png)
C.斜面对B球的弹力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311420914.png)
D.B球对A球的弹力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311436598.png)
A
试题分析:对物体A进行受力分析如图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500531146710313.png)
可知斜面对A的弹力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311482796.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311498777.png)
对B进行受力分析如下图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500531154513519.png)
则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311560951.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311592998.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311607532.png)
联立可得斜面对B球的弹力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053116231064.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005311420914.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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