题目内容
(8分)在“探究小车速度随时间变化的规律”实验中,得到了一条记录小车运动的纸带,如图所示 (实验所用的交流电频率为50 Hz ) 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408551298386.jpg)
(1)请在纸带上选取6个测量点并标在纸带上,要求所标的测量点以刻度尺的零点作为起始点,每相邻两个测量点之间还有1个计时器打下的点。每两个相邻测量点之间的间距用
表示,利用图中的刻度尺完成对纸带的测量,并填入下表:
(2)根据表中的数据绘出速度v与时间t的图象;
(3)分析小车的运动情况,并求出加速度的大小。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408551298386.jpg)
(1)请在纸带上选取6个测量点并标在纸带上,要求所标的测量点以刻度尺的零点作为起始点,每相邻两个测量点之间还有1个计时器打下的点。每两个相邻测量点之间的间距用
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140855160321.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
| | | | | |
(3)分析小车的运动情况,并求出加速度的大小。
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414085600324631.png)
(3)匀加速直线运动![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140856081650.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
1.62 | 2.13 | 2.63 | 3.12 | 3.60 | 4.00 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414085600324631.png)
(3)匀加速直线运动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140856081650.png)
(2)实验用的交流电频率为50Hz,两测量点间的时间为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140856112707.png)
根据
得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408564241291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408564711296.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408565331337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408566111351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408566741340.png)
速度v与时间t的图像
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414085600324631.png)
(3)从速度v与时间t的图像分析小车作匀加速直线运动,
由图的斜率知,加速度的大小为
评分标准:(1)3分;(2)3分;(3)2分。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140856112707.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140856206910.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408564241291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408564711296.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408565331337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408566111351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408566741340.png)
速度v与时间t的图像
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414085600324631.png)
(3)从速度v与时间t的图像分析小车作匀加速直线运动,
由图的斜率知,加速度的大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140856081650.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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