题目内容
如右图所示,质量为m的小物块以初速度
沿足够长的固定斜面上滑,斜面倾角为θ,物块与该斜面间的动摩擦因数
,下图表示该物块的速度v和所受摩擦力Ff随时间t变化的图线(以初速度v0的方向为正方向)中可能正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242154128761605.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242154137187520.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215410458332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215411815610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242154128761605.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242154137187520.jpg)
C
试题分析:因为μ>tan θ,所以重力沿斜面向下的分力小于滑动摩擦力,物体沿斜面上滑时做匀减速运动,所受摩擦力为滑动摩擦力,当速度减为零时,物体静止,受到静摩擦力,ABD错误
C正确.
故选C
点评:本题关键要根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824215411815610.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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