题目内容
下表是某同学为探究弹簧弹力和伸长量的关系所测的几组数据.
(1)请你在图的坐标纸上作出F-x图线.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241512426902753.png)
(2)写出曲线所代表的函数式.
(3)解释函数表达式中常量的物理意义.
(4)若弹簧的原长为40 cm,并且以弹簧的总长为自变量,请你写出它的函数式.
弹力F/N | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
伸长x/cm | 2.30 | 5.08 | 6.89 | 9.80 | 12.40 |
(1)请你在图的坐标纸上作出F-x图线.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241512426902753.png)
(2)写出曲线所代表的函数式.
(3)解释函数表达式中常量的物理意义.
(4)若弹簧的原长为40 cm,并且以弹簧的总长为自变量,请你写出它的函数式.
(1)见解析(2)(2)
(3)劲度系数 (4)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242830563.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242768494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242830563.png)
试题分析:(1)如图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415124289211784.png)
(2)由图象可知,图线的斜率
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242970453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242768494.png)
(3)图线斜率只跟弹簧本身性质有关,物理学称之为劲度系数
(4)由题意可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151243080466.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151243360689.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242768494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151242830563.png)
点评:中等难度。通过分析收集的实验数据,得出了在弹簧的测量范围内,弹簧的伸长量与弹力成正比例关系这一结论。
![](http://thumb2018.1010pic.com/images/loading.gif)
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