题目内容
如图所示,质量为M,长度为L的小车静止在光滑的水平面上,质量为m的小物块,放在小车的最左端,现用一水平向右的恒力F始终作用在小物块上,小物块与小车之间的滑动摩擦力为f,经过一段时间后小车运动的位移为x,此时小物块刚好滑到小车的最右端,则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013426654399.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013426654399.jpg)
A.此时物块的动能为F(x+L) |
B.此时小车的动能为f(x+L) |
C.这一过程中,物块和小车增加的机械能为F(x+L)-fL |
D.这一过程中,物块和小车因摩擦而产生的热量为fL |
CD
试题分析:对小物块分析,水平方向受到拉力F和摩擦力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342665318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342681275.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342696279.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342712884.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342665318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342681275.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342759620.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342774900.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342805564.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001342821853.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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