题目内容
如下图所示,A、B两物体叠放在一起沿倾角为
的斜面匀速下滑,已知它们的质量分别为
和
,A与B之间、B与斜面之间的动摩擦因数分别为
和
,则A、B之间的摩擦力大小为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005547732379.jpg)
A.0 B.
C.
D.![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554820655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554664294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554680402.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554711392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554727330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554742358.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005547732379.jpg)
A.0 B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554789740.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554805755.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000554820655.png)
D
试题分析:据题意,A、B物体均匀速下滑,据物体的平衡条件,它们的合力均为0,对A物体受力分析,受到重力G,支持力N和摩擦力f,则沿斜面方向有:f=mgsinθ,所以D选项正确。
![](http://thumb2018.1010pic.com/images/loading.gif)
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