题目内容
如图所示,两物体A和B,质量分别为m1和m2相互接触放在水平面上.对物体A施以水平的推力F,使A和B一起向右作匀加速直线运动,则物体A对物体B的作用力等于:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241549500151119.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241549500151119.png)
A.![]() | B.![]() |
C.F | D.![]() |
B
试题分析:把A、B看成一个整体,根据牛顿第二定律可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154950686972.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154951013853.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154951076427.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154951216822.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154951325837.png)
故选B
点评:本题没有说明水平面是否光滑,默认为粗糙具有普适性。先整体法求加速度,在隔离法分析物体间的作用力是这类问题的常用方法。
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.![]() | B.![]() |
C.F | D.![]() |