题目内容
甲、乙、丙三个质量相同的物体均在水平地面上做直线运动,如图所示.地面与物体间的动摩擦因数均相同,下列判断正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241515465833739.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241515465833739.jpg)
A.三个物体所受的摩擦力大小相同 |
B.甲物体所受的摩擦力最小,受地面的弹力最小 |
C.乙物体所受的摩擦力最大,受地面的弹力最小 |
D.丙物体所受的摩擦力最大,受地面的弹力最大 |
BD
试题分析:对物体进行受力分析:甲图中有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151546598984.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151546645868.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151546770684.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151546848646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241515469101024.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151546973928.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151547113697.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151547176751.png)
故选BD
点评:知道滑动摩擦力公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151547378597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151547503409.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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