题目内容
在“探究求合力的方法”实验中,橡皮条在两个弹簧测力计的作用下,沿直线GC伸长了EO的长度,两个弹簧测力计的作用力大小分别为F1、F2,橡皮条对O点的作用力大小为F0,F1、F2与GC的夹角分别为
,且
>
,则这三个力的大小关系正确的是 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241530224626371.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153022197414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153022321281.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153022384324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241530224626371.png)
A.F1>F2 | B.![]() | C.![]() ![]() | D.![]() |
BC
试题分析:以O点为研究对象进行受力分析如下图,由于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153022321281.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153022384324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153022587463.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153023117536.png)
故选BC
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241530235072944.jpg)
点评:本题可以利用几何知识进行判断比较,知道矢量三角形中,线段长度代表大小。
![](http://thumb2018.1010pic.com/images/loading.gif)
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