题目内容
如右图所示 质量为M的小车静止放在光滑的水平面上,质量为m的物体放在小车的一端.受到水平恒力F作用后,物体由静止开始运动,设小车与物体间的摩擦力为f,车长为L,车发生的位移为S时,物体从小车一端运动到另一端,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012552881457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012552881457.png)
A.物体具有的动能为(F-f)(S+L) |
B.小车具有的动能为fS |
C.这一过程中物体与车之间产生的热量为f(S+L) |
D.物体克服摩擦力所做的功为f(S+L) |
ABD
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012553036336.jpg)
试题分析:据题意,m水平方向受到拉力F和水平向左的摩擦力f,据动能定理得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012553351030.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255350743.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255366663.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255381690.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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