题目内容
如图所示,在光滑水平面上, 放着两块长度相同,质量分别为M1和M2的木板,在两木板的左端各放一个大小.形状.质量完全相同的物块。开始时,各物块均静止,今在两物块上各作用一水平恒 力F1.F2,当物块和木板分离时,两木板的速度分别为
和
,物体和木板间的动摩擦因数相同,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034002322775.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400185634.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400216671.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034002322775.jpg)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
BD
以物块为研究对象:
,以木板为研究对象:
。当
时,
相同,
,
。由图(1)可知
,A项错。同理,B项正确。当
时,
,
,
。由图(2)可知,
,C项错。同理,D项正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034010128991.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400622720.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400637733.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400653439.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400668343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400668569.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400684441.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400700437.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400731462.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400731519.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400762535.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400778422.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003400700437.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034010128991.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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