题目内容
如图甲所示,在气垫导轨的左端固定一轻质弹簧,轨道上有一滑块A紧靠弹簧但不连接,已知滑块的质量为m
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911043897084.jpg)
(1)用游标卡尺测出滑块A上的挡光片的宽度,读数如图乙所示,则宽度d= mm;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911044987860.jpg)
(2)为探究弹簧的弹性势能,某同学打开气源,用力将滑块A压紧到P点,然后释放,滑块A上的挡光片通过光电门的时间为
,则弹簧的弹性势能的表达式为 (用题中所给字母表示);
(3)若关闭气源,仍将滑块A由P点释放,当光电门到P点的距离为x时,测出滑块A上的挡光片通过光电门的时间为t,移动光电门,测出多组数据(滑块都能通过光电门),并绘出
图像,如图丙所示,已知该图线的斜率的绝对值为k,则可算出滑块与导轨间的动摩擦因数为 .![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911051854213.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911043897084.jpg)
(1)用游标卡尺测出滑块A上的挡光片的宽度,读数如图乙所示,则宽度d= mm;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911044987860.jpg)
(2)为探究弹簧的弹性势能,某同学打开气源,用力将滑块A压紧到P点,然后释放,滑块A上的挡光片通过光电门的时间为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191104608374.png)
(3)若关闭气源,仍将滑块A由P点释放,当光电门到P点的距离为x时,测出滑块A上的挡光片通过光电门的时间为t,移动光电门,测出多组数据(滑块都能通过光电门),并绘出
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191104920478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911051854213.jpg)
(1)5.10(2)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191105310852.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191105637631.png)
试题分析:(1)卡尺的读数为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911059181029.png)
(2)由于光电门比较窄,所以通过其的平均速度可看做瞬时速度,故
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191106199598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191106495994.png)
(3)每次都是从P点释放,则弹簧的弹性势能相同,所以有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241911068851345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191107135839.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191107494738.png)
点评:由于光电门比较窄,所以通过其的平均速度可看做瞬时速度,
![](http://thumb2018.1010pic.com/images/loading.gif)
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