题目内容
质量为2kg的物体以一定的初速度沿倾角为30°的斜面向上滑行,在向上滑行和向下滑行的过程中,其动能随物体到斜面底端距离的变化关系如图所示,则物体在斜面上受到的摩擦力为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018372095158.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018372095158.jpg)
A.14N |
B.10N |
C.6N |
D.4N |
D
试题分析:当向上滑行时,重力和摩擦力都是做负功,在斜面最顶端时的动能为零,所以根据动能定理可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018372251085.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001837240523.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.14N |
B.10N |
C.6N |
D.4N |