题目内容
如图所示,木块质量
,它以速度
水平地滑上一辆静止的平板小车,已知小车质量
,木块与小车间的动摩擦因数为
,木块没有滑离小车,地面光滑,g取10
,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412071817883.png)
①木块相对小车静止时小车的速度的大小;
②从木块滑上小车到木块相对于小车刚静止时,小车移动的距离.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206760622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206838581.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141206978669.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141207025475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141207103426.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412071817883.png)
①木块相对小车静止时小车的速度的大小;
②从木块滑上小车到木块相对于小车刚静止时,小车移动的距离.
①
;②16m
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141207244499.png)
①设木块相对小车静止时小车的速度为
根据动量守恒定律有:
(2分)
(1分)
②对小车,根据动能定理有:
(2分)
(1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141207275265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141207368776.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412074151400.png)
②对小车,根据动能定理有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412074931033.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412075401591.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目