题目内容
(9分)如图所示,两木块的质量分别为
和
,两轻质弹簧的劲度系数分别为
和
,上面木块压在上面的弹簧上(但不拴接),整个系统处于平衡状态。现缓慢向上提上面的木块,直到它刚离开上面弹簧,求这过程中下面的木块和上面的木块分别移动的距离是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337008360.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337055384.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337164337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337273365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337320493.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337429612.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337554763.png)
试题分析:原来对整体
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337632769.png)
原来对
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337008360.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337804608.png)
后来对
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337055384.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337928681.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337055384.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145338147829.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145337008360.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241453383031025.png)
点评:在解此类型的问题时,需要先对物体的受力情况进行分析,然后结合力的平衡条件解题,另外整体法和隔离法是研究物理问题时常用并且方便的方法,在高考中也是一种热点
![](http://thumb2018.1010pic.com/images/loading.gif)
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