题目内容
(12分)某同学将力传感器固定在小车上,然后把绳的一端固定在传感器的挂钩上,用来测量绳对小车的拉力,探究在小车及传感器总质量不变时加速度跟它们所受拉力的关系,根据所测数据在坐标系中作出了如图所示的
图像。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500202357013269.jpg)
(1)图像不过坐标原点的原因是_____________;
(2)本实验中是否仍需要细沙和桶的总质量远小于小车和传感器的总质量______(填 “是”或“否”);
(3)由图像求出小车和传感器的总质量为_________kg;通过实验得到如图所示的纸带,纸带上
点为小车运动起始时刻所打的点,选取时间间隔为 0.1s 的相邻计数点A、B、C、D、E、F、G。则小车运动的加速度为
=
(保留3位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020236338204.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023555407.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500202357013269.jpg)
(1)图像不过坐标原点的原因是_____________;
(2)本实验中是否仍需要细沙和桶的总质量远小于小车和传感器的总质量______(填 “是”或“否”);
(3)由图像求出小车和传感器的总质量为_________kg;通过实验得到如图所示的纸带,纸带上
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023586292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023601283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023617489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020236338204.jpg)
(1)未平衡摩擦力或平衡摩擦力不足 (2) 否 (3)
;![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023664799.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023648485.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023664799.png)
试题分析:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023555407.png)
(2)该实验中由于已经用传感器测出绳子拉力大小,不是将砝码和砝码盘的重力作为小车的拉力,故不需要满足砝码和砝码盘的总质量远小于小车的质量。
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023555407.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023711460.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020237261060.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023742817.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023757681.png)
可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020237733038.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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