题目内容
物体A、B、C均静止在同一水平面上,它们的质量分别为mA、mB、mC与水平面间的动摩擦因数分别为μA、μB、μC,现用平行于水平面的拉力F分别拉A、B、C,所得加速度
与拉力F的关系如图所示,对应直线A、B、C中的A、B两直线平行,则下列说法中正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241604255821869.png)
A.
B.
C.
D. ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160426409698.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160425192283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241604255821869.png)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160425785701.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160425956693.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160426190716.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160426409698.png)
AD
试题分析:根据牛顿第二定律有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160426643671.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160426923716.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160427220365.png)
故由图象可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160427360855.png)
点评:高中物理中涉及图象很多,但是物理什么图象,都可以通过所学物理规律写出两物理量的函数关系式,然后依据数学知识弄清截距、斜率、面积等含义.
![](http://thumb2018.1010pic.com/images/loading.gif)
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