题目内容
如图所示,质量2.0kg的小车放在光滑水平面上,在小车右端放一质量为1.0kg的物块,物块与小车之间的动摩擦因数为0
.5,当物块与小车同时分别受到水平向左
=6.0N的拉力和水平向右
=9.0N的拉力,经0.4s同时撤去两力.(g取10
)
试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223477263044.jpg)
(1)撤去两力时,物块与小车的速度分别为多少?
(2)为使物块不从小车上滑下,求小车最少要多长?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412234750872.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122347523213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122347539215.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122347711360.gif)
试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223477263044.jpg)
(1)撤去两力时,物块与小车的速度分别为多少?
(2)为使物块不从小车上滑下,求小车最少要多长?
(1)物体的速度V1=0.4m/s
小车的速度V2=0.8m/s
(2)L=0.336m
小车的速度V2=0.8m/s
(2)L=0.336m
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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