题目内容
如图所示,光滑水平面上有一质量
的带有圆弧轨道的平板车,车的上表面是一段长
的粗糙水平轨道,水平轨道左侧连一半径
的
光滑圆弧轨道,圆弧轨道与水平轨道在O′点相切,车右端固定一个尺寸可以忽略、处于锁定状态的压缩弹簧,一质量
的小物块紧靠弹簧放置,小物块与水平轨道间的动摩擦因数
,整个装置处于静止状态,现将弹簧解除锁定,小物块被弹出,恰能到达圆弧轨道的最高点A,取
,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241253045084136.jpg)
小题1:小物块到达A点时,平板车的速度大小;
小题2:解除锁定前弹簧的弹性势能;
小题3:小物块第二次经过O′点时的速度大小;
小题4:小物块与车最终相对静止时,它距O′点的距离。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304383494.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304398413.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304414455.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304430221.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304445457.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304461290.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304492473.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241253045084136.jpg)
小题1:小物块到达A点时,平板车的速度大小;
小题2:解除锁定前弹簧的弹性势能;
小题3:小物块第二次经过O′点时的速度大小;
小题4:小物块与车最终相对静止时,它距O′点的距离。
小题1:0
小题2:7.5J
小题3:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304523420.gif)
小题4:0.5m
物块到达A处时,与车共速,系统水平方向动量守恒:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304539611.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304570684.gif)
(3)从A点到O′,系统动量守恒,机械能守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304586517.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304586747.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304523420.gif)
(4)最终相对静止时,速度为0,根据功能关系:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304617762.gif)
所以距
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304539611.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304570684.gif)
(3)从A点到O′,系统动量守恒,机械能守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304586517.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304586747.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304523420.gif)
(4)最终相对静止时,速度为0,根据功能关系:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304617762.gif)
所以距
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125304632473.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目