题目内容
如图所示,两个物体质量分别为 m1 =1kg和m2=2kg,紧靠在一起并放在光滑水平面上,如果施以向右的水平力F1=2N和向左的水平力F2=5N,则m1与m2之间的相互作用力大小是 N。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204337989.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204337989.png)
3
试题分析:根据受力整体会向左加速运动,设向左为正方向,把两个物体看成一个整体,根据牛顿第二定律由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204415816.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204540362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204649386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204540362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152204930610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152205055509.png)
点评:本题是典型的连接体问题,如果求物体间的相互作用一般整体再隔离,如果求外部作用力一般先隔离再整体
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容