题目内容
如图所示,用力拉三个物体在光滑水平面上一起运动,在中间物体上加一小物体,仍让它们一起运动,且拉力F不变,那么中间物体两端绳的拉力FA、FB的变化情况是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007036792931.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007036792931.jpg)
A.FA增大,FB增大 |
B.FA增大,FB减小 |
C.FA减小,FB增大 |
D.FA减小,FB减小 |
B
试题分析:假设三个物块从左到有质量依次为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703710545.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703726337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703757830.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703772701.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703788667.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703804606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703835880.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703850373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000703866373.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.FA增大,FB增大 |
B.FA增大,FB减小 |
C.FA减小,FB增大 |
D.FA减小,FB减小 |