题目内容
(13分)某同学在“研究匀变速直线运动”实验中,使用电磁式打点计时器(所用交流电的频率
)选出一条点迹比较清晰的纸带,舍去开始密集的点迹,从便于测量的点开始,每两个打点间隔取一个计数点,如图中0、1、2……6点所示.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500115379211139.png)
①测量1、2、3……6计数点到0计数点的距离,分别记作:
、
、
……![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153839326.png)
②通过测量和计算,该同学判断出小车沿平板做匀加速直线运动,计数点1对应速度大小
= (用题给符号表示)
③分别计算出
、
、
……
与对应时间的比值
、
、
……![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154182449.png)
④以
为纵坐标、
为横坐标,标出
与对应时间t的坐标点,画出
图线如图所示,根据
图线判断,在打0计数点时,小车的速度
= m/s;运动的加速度
= m/s2
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153777520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500115379211139.png)
①测量1、2、3……6计数点到0计数点的距离,分别记作:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153808300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153824331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153839331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153839326.png)
②通过测量和计算,该同学判断出小车沿平板做匀加速直线运动,计数点1对应速度大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154042298.png)
③分别计算出
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153808300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153824331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153839331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001153839326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154136408.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154151459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154167456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154182449.png)
④以
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154198368.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154198267.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154198368.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154229440.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154229440.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154260323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154292283.png)
②
(4分) ④0.29~0.30(4分) ,4.0~4.3(5分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154307505.png)
试题分析:②利用匀变速直线运动的平均速度等于中间时刻的瞬时速度,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154323766.png)
④由匀变速直线运动规律
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154338767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154370859.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154229440.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154401713.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250011544161424.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001154448674.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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