题目内容
如图所示,小车在与水平地面成α角的恒力F的作用下,沿水平地面向左运动了一段距离l,此过程中力F对小车所做的功为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102122170045029.png)
A.Fl | B.Flsinα | C.Flcosα | D.Fltanα |
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102122170045029.png)
由图可知,力和位移的夹角为α,故推力的功W=Flcosα;
故选:C.
故选:C.
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.Fl | B.Flsinα | C.Flcosα | D.Fltanα |