题目内容
如图,物块A放在倾斜的木板上,木板的倾角α为30°和45°时物块所受摩擦力的大小恰好相同,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434496101513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434496101513.png)
A.物块和木板间的动摩擦因数为0.5 |
B.物块和木板间的动摩擦因数为![]() |
C.木板的倾角α为45°时物块可能在斜面上做匀速运动 |
D.木板的倾角α为45°时物块一定在斜面上做匀加速运动 |
BD
30°时为静摩擦力,45°时为滑动摩擦力,所以
,B对;木板的倾角为45°,有
,D对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434498121648.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434498751808.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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