题目内容
某学校物理兴趣小组利用光控实验板进行了“探究自由落体的下落高度与速度之间的关系”的实验,如图甲所示.同学将数据记录在Excel软件工作簿中,利用Excel软件处理数据,如图乙所示,小组进行探究,得出结论.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036020995100.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500360213033636.jpg)
在数据分析过程中,小组同学先得出了vB-h图象,继而又得出v
-h图象,如图丙、丁所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500360216111135.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500360217711057.jpg)
请根据图象回答下列问题:
(1)小明同学在得出vB-h图象后,为什么还要作出v
-h图象?________________________ ________________________________________________.
(2)若小球下落过程机械能守恒,根据实验操作及数据处理,求出图丁图象的斜率为k,则重力加速度g=________.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036020995100.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500360213033636.jpg)
在数据分析过程中,小组同学先得出了vB-h图象,继而又得出v
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602146305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500360216111135.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500360217711057.jpg)
请根据图象回答下列问题:
(1)小明同学在得出vB-h图象后,为什么还要作出v
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602146305.png)
(2)若小球下落过程机械能守恒,根据实验操作及数据处理,求出图丁图象的斜率为k,则重力加速度g=________.
(1)先作出的vB-h图象,不是一条直线,根据形状无法判断vB、h关系,进而考虑v
-h图象,从而找出v
、h之间的线性关系 (2)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602255423.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602146305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602146305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602255423.png)
由v
=2gh可知v
-h图象k=2g,重力加速度g=
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602146305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602146305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003602255423.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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