题目内容
某同学做《共点的两个力的合成》实验作出如图所示的图,其中
为固定橡皮条的固定点,
为橡皮条与细绳的结合点,图中___________是
、
合力的理论值, 是合力的实验值,需要进行比较的是
与
的 和 ,通过本实验,可以得出结论: 。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241322599462858.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259665302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259696300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259728333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259759356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259790303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259899342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241322599462858.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259790303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259899342.png)
在误差允许的范围内,两个分力的合力满足平行四边形定则(2分)
因为实验中的误差是不可避免的,所以图中F为两个分力的理论值,
为两分力的实验值,通过比较
与
的大小(长度可表示力的大小)和方向,在误差允许的范围内,两个分力的合力满足平行四边形定则。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259899342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259790303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132259899342.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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