题目内容
一质量为m的物体在水平恒力F的作用下沿水平面运动,在
时刻撤去力F,其
-
图象如图所示。已知物体与水平面间的动摩擦因数为μ,则下列关于力F的大小和力F做的功
的大小,表示正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241938481163475.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193846166319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193846666265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193847009267.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193847555396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241938481163475.jpg)
A.![]() | B.![]() |
C.![]() | D.![]() |
A
试题分析:撤去拉力F后物体在摩擦力的作用下做匀减速直线运动,在整个过程中物体走故的位移为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193850503632.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193851439577.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241938520161299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193852609868.png)
点评:本题难度较小,应用动能定理求解问题时研究过程既可以是一段过程也可以是整段过程
![](http://thumb2018.1010pic.com/images/loading.gif)
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