题目内容
粗糙水平面上放有P、Q两个木块,它们的质量依次为m1、m2,与水平面的动摩擦因数依次为μ1、μ2。分别对它们施加水平拉力F,它们的加速度a随拉力F变化的规律如图所示。下列判断正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005585021798.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005585021798.jpg)
A.m1>m2,μ1>μ2 | B.m1>m2,μ1<μ2 |
C.m1<m2,μ1>μ2 | D.m1<m2,μ1<μ2 |
B
试题分析:木块在水平面受到拉力和摩擦力作用,根据牛顿第二定律有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000558533976.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000558549407.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000558564382.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000558595495.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000558611377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000558627467.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005586422353.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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