题目内容
(14分)如图所示,在表面粗糙、倾角为37的斜面上,有一质量为
的物块,被平行于斜面的力F推着沿斜面向上运动,推力F与物块速度
随
时间
变化规律如图所示。(
)求:
(1)物块的质量
。
(2)物块与斜面之间的动摩擦因数
。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223071977726.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122306995204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307041185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412230705771.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412230707365.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307088679.gif)
(1)物块的质量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122306995204.gif)
(2)物块与斜面之间的动摩擦因数
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307151204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223071977726.jpg)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307213452.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307229288.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307213452.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307229288.gif)
0—4s:物块做初速度为零的匀加速运动,速度达到v=lm/s
…………(3分)
…………(2分)
…………(1分)
依据
图象知
可知:
…………(1分)
4s—6s:物块由速度
做匀减速运动,速度至零,
…………(3分)
同理解得
…………………………(1分)
再依据
图象数据,可解得:
……………(2分)
…
…………(1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307244664.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307244537.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307275405.gif)
依据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307291215.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307307372.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307322519.gif)
4s—6s:物块由速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307353400.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307369678.gif)
同理解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307385489.gif)
再依据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307400229.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307213452.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122307229288.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412230746372.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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