题目内容
如图所示,一细线的一端固定于倾角为45°的光滑斜面体的顶端P处,细线的另一端拴一质量为m的小球。求:
(1)当斜面体至少以多大的加速度向左运动时,小球对斜面的压力为零?
(2)当斜面体以a=2g的加速度向左运动时,线中拉力为多大?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228369354265.jpg)
(1)当斜面体至少以多大的加速度向左运动时,小球对斜面的压力为零?
(2)当斜面体以a=2g的加速度向左运动时,线中拉力为多大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228369354265.jpg)
(1)对小球受力分析如图所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228369664020.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122836966606.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122836998532.gif)
(2)当斜面体以
的加速度向左运动时,对小球受力分析如图:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228370601733.jpg)
所以小球会飘起来,假设F与水平面夹角为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837107200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837122672.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837154348.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837169396.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837185645.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228369664020.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122836966606.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122836998532.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837013251.gif)
(2)当斜面体以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837029273.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228370601733.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837091444.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837107200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837122672.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837154348.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837169396.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122837185645.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目