题目内容
如右图所示,质量为m的物体在与水平方向成θ的恒力F作用下以加速度a做匀加速度直线运动,已知物体和地面间的动摩擦因数为μ,物体在地面上运动距离为x的过程中力F做功为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301081241451.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301081241451.jpg)
A.![]() | B.![]() |
C.![]() | D.![]() |
B
以物体为研究对象,竖直方向有
,水平方向有
,联立解得
,在此过程中F做功
,故正确选项为B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130108280682.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130108311676.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130108327913.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301083581089.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() |
C.![]() | D.![]() |