题目内容
如图所示,一物体分别沿AO、BO轨道由静止滑到底端,物体与轨道间的动摩擦因数相同,物体克服摩擦力做功分别为W1和W2,滑到底端时的速度大小为v1、v2,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241807323041450.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241807323041450.png)
A.W1>W2 v1>v2 | B.W1=W2![]() |
C.W1<W2v1<v2 | D.W1=W2v1<v2 |
B
试题分析:设斜面的倾角为θ,滑动摩擦力大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180732788656.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180733084671.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180733302512.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241807335051046.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180733724538.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180732538447.png)
故选B.
点评:解决本题的关键掌握功的公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180734223682.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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