题目内容
右端连有光滑弧形槽的水平桌面AB长L=1.5 m,如右图所示.将一个质量为m=0.5 kg的木块在F=1.5 N的水平拉力作用下,从桌面上的A端由静止开始向右运动,木块到达B端时撤去拉力F,木块与水平桌面间的动摩擦因数μ=0.2,取
.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242139590402050.jpg)
(1)木块沿弧形槽上升的最大高度;
(2)木块沿弧形槽滑回B端后,在水平桌面上滑动的最大距离.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213957807625.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242139590402050.jpg)
(1)木块沿弧形槽上升的最大高度;
(2)木块沿弧形槽滑回B端后,在水平桌面上滑动的最大距离.
(1)0.15 m (2)0.75 m
试题分析:(1)由动能定理得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213959492675.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242140006001200.png)
所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242140013481420.png)
(2)由动能定理得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214002612626.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242140038441422.png)
点评:在分析多过程问题时,动能定理可以方便我们解题,但是在使用时一定要注意过程中的始末状态
![](http://thumb2018.1010pic.com/images/loading.gif)
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