题目内容
如图所示,光滑的弧形轨道BC与粗糙的水平轨道AB相切,AB长为10m,BC足够高,一物体以v0=10m/s的速度从A点出发,最后恰好又停在A点,
(g取l0m/s2).求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202639145497.png)
(1)物体与水平轨道的摩擦因数;
(2)小球在倾斜轨道BC上的最大高度.
(g取l0m/s2).求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202639145497.png)
(1)物体与水平轨道的摩擦因数;
(2)小球在倾斜轨道BC上的最大高度.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202640206526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202640924571.png)
试题分析:(1)对全过程运用动能定理得,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242026419691025.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202640206526.png)
(2)对开始到运动到最高点运用动能定理得,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242026435131084.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202640924571.png)
点评:运用动能定理解题,要合适地选择研究的过程,列表达式进行求解.有时过程选得好,可以起到事半功倍的效果.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目