题目内容
(9分).如图所示,水平面上有一固定着轻质定滑轮O的木块A,它的上表面与水平面平行,它的右侧是一个倾角
的斜面。放置在A上的物体B和物体C通过一轻质细绳相连,细绳的一部分与水平面平行,另一部分与斜面平行。现对A施加一水平向右的恒力F,使A、B、C恰好保持相对静止。已知A、B、C的质量均为m,重力加速度为g,不计一切摩擦,求恒力F的大小。(
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010210973381.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021066477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021081862.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010210973381.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021113522.png)
试题分析:设绳子张力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021128309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021144362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021175287.png)
对B分析根据牛顿第二定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021175518.png)
对C分析同样有牛顿第二定律水平方向
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021222923.png)
竖直方向
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021237951.png)
整理解:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021253515.png)
对ABC整体分析水平方向
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001021269687.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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