题目内容
(5分)在探究弹力和弹簧伸长的关系实验中,得到某弹簧的伸长量x与弹力f之间的关系图象,下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452053113319.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452052952758.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452053113319.jpg)
A.弹簧的劲度系数为30.0N/m |
B.弹簧发生弹性形变时,弹力大小与弹簧伸长(或缩短)的长度成正比 |
C.由图象可知弹簧原长为5.0cm |
D.当弹簧伸长2.5cm时,弹簧弹力为0.75N |
ABD
试题分析:从图中可知,当f=1.2N时,弹簧的伸长量为4cm,根据胡克定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145205327460.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452054051068.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145205763993.png)
点评:本实验是一个基础实验,关键是理解图中的横坐标表示弹簧的伸长量,不是表示弹簧的长度,
![](http://thumb2018.1010pic.com/images/loading.gif)
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