题目内容
如图所示,质量m =1.6kg的滑块原来处于水平面AB上,在大小为F1=8.0N的水平推力作用下向右匀速运动,接着进入倾角θ=37°的斜面BC运动.
(1)求滑块与水平面间的动摩擦因数μ.
(2)若斜面与滑块间的动摩擦因数也为μ,且将一个水平推力F2作用到滑块上,使其沿斜面匀速向上运动,如图所示.求F2的大小.
(sin37°=0.6,cos37°=0.8)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149106922485.gif)
(1)求滑块与水平面间的动摩擦因数μ.
(2)若斜面与滑块间的动摩擦因数也为μ,且将一个水平推力F2作用到滑块上,使其沿斜面匀速向上运动,如图所示.求F2的大小.
(sin37°=0.6,cos37°=0.8)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149106922485.gif)
(1)0.50 (2)32N
(1)滑块在水平面匀速运动,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910707481.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910723417.gif)
代入数据解得动摩擦因数
μ = 0.50
(2)滑块沿斜面匀速向上运动,受力情况如图,可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910754666.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910770681.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910785429.gif)
代入数据解得
F2= 32N
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910707481.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910723417.gif)
代入数据解得动摩擦因数
μ = 0.50
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149107392021.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910754666.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910770681.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114910785429.gif)
代入数据解得
F2= 32N
![](http://thumb2018.1010pic.com/images/loading.gif)
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