题目内容
如图所示,质量分别为1 kg和2kg的A、B两物体叠放在一起,A用绳系住,放在B的右端。今用力F将B向右拉出,已知F="5" N,A、B问的滑动摩擦力为1N,B板长2 m。从A在B右端开始到A(可看成质点)脱离B板过程中,拉力F做功为 __________J,物体B对物体A的摩擦力做功为__________J,物体A对物体B的摩擦力做功为_______J。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241242593052700.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241242593052700.png)
10 0 -2
拉力F做功为
,A物体相对于地面保持静止状态,所以物体B对物体A的摩擦力做功为0J,物体A对物体B的摩擦力做负功,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124259429847.png)
故答案为:10 0 -2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124259351818.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124259429847.png)
故答案为:10 0 -2
![](http://thumb2018.1010pic.com/images/loading.gif)
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