题目内容
如图所示,在光滑的桌面上有M、m两个物块,现用力F推物块m,使M、m两物块在桌上一起向右加速,则M、m间的相互作用力为:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241524158772857.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241524158772857.jpg)
A.![]() |
B.![]() |
C.若桌面的摩擦因数为![]() ![]() |
D.若桌面的摩擦因数为![]() ![]() |
B
试题分析:由于桌面光滑M、m一起加速,以M、m为整体为研究对象由牛顿第二定律有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152416532830.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152416594334.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241524166571079.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152416048301.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241524168281090.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152416906352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152416969793.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152417047917.png)
点评:中等难度。当两个以上的物体组成的系统加速度相同时,先由整体法求出共同的加速度,再用隔离法求物体间的相互作用力
![](http://thumb2018.1010pic.com/images/loading.gif)
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