题目内容
在倾角为θ=30°的足够长的斜面底端,木块A以某一初速度v0沿斜面向上运动,若木块与斜面间的动摩擦因数μ=
,g取10m/s2,试求:
(1)木块A在斜面上离开出发点时和回到出发点时的动能之比
(2)如图所示,在斜面底端安装一固定且垂直于斜面的挡板,不计物块与挡板每次碰撞的机械能损失,求物块以v0=10m/s的初速度沿斜面运动所通过的总路程![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241245229812117.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124522965293.gif)
(1)木块A在斜面上离开出发点时和回到出发点时的动能之比
(2)如图所示,在斜面底端安装一固定且垂直于斜面的挡板,不计物块与挡板每次碰撞的机械能损失,求物块以v0=10m/s的初速度沿斜面运动所通过的总路程
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241245229812117.jpg)
(13分)
(1)向上运动时:
(2分)
向下运动时:
(2分)
联列可得:
(3分)
(2)全过程:由于
,所以物块停在斜面的最下端。(2分)
(2分),解得:
(3分)
(1)向上运动时:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124522996836.gif)
向下运动时:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124523012806.gif)
联列可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124523028454.gif)
(2)全过程:由于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124523043730.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124523059775.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124523074434.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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