题目内容
如图所示,在倾角为
的光滑斜面顶端有一质点
自静止开始自由下滑,同时另一质点
自静止开始由斜面底端向左以恒定加速度
沿光滑水平面运动,
滑下后能沿斜面底部的光滑小圆弧平稳地朝
追去,为使
能追上
,
的加速度最大值是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306096412159.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609049297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609189283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306096412159.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609688718.png)
设
在斜面上下滑用时
,在平面上追赶
用时
,则
运动的总时间为
。
设
的加速度最大为
,在这种情况下满足
恰好能够追上
,
即
追上
时
、
共速。 (1分)
滑到平面上的速度为
(1) (3分)
对
、
在水平面上的追赶过程有
(2) (3分)
追上时
、
共速有
(3) (3分)
由(1)(2)(3)两式可得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609688718.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609751291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609813327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609985412.png)
设
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609189283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130610624677.png)
对
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130610967936.png)
追上时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609080300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609095309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130611264711.png)
由(1)(2)(3)两式可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130609688718.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目