题目内容
(8分)) 质量为m=lkg的物体在平行于斜面向上的拉力 F的作用下从斜面底端由静止开始沿斜面向上运动,一段时间后撤去拉力F,其向上运动的v-t图象如图所示,斜面固定不动,与水平地面的夹角
(
)。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020348186809.png)
(1)物体与斜面间的动摩擦因数![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034833301.png)
(2)拉力F的大小;
(3)物体沿斜面向上运动的最大距离![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034849324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034771474.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020348021298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020348186809.png)
(1)物体与斜面间的动摩擦因数
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034833301.png)
(2)拉力F的大小;
(3)物体沿斜面向上运动的最大距离
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034849324.png)
(1)0.25 (2)12N (3)48m
试题分析:(1)(2)取沿斜面向上为正方向,0~4s内,由图像可知:加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034880933.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034896986.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034911867.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034958780.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034974528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002035114828.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034958780.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002034974528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002035192526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002035208555.png)
(3)根据图像与坐标系包围的面积等于物体的位移,所以物体沿斜面向上运动的最大位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002035239981.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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