江西省吉安县高中物理第二章匀变速直线运动的研究2.1实验:探究小车速度随时间变化的规律导学案新人教版必修1.doc

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1、12.1 实验:探究小车速度随时间变化的规律高一物理备课组 使用时间: 班级: 姓名: 【学习目标】-导1.能熟练使用打点计时器。2.会根据相关实验器材,设计实验并完成操作。3.会处理纸带求各点瞬时速度。4.会设计表格并用表格处理数据。5.会用 v-t 图像处理数据,表示运动规律【了解感知】-思1实验目的:探究小车速度随_变化的规律2实验原理:利用_打出的纸带,记录数据,作出图象,寻找小车速度随时间变化的规律 3实验器材:打点计时器、_、电源、带滑轮的长木板、小车、_、细线、刻度尺4. 打点计时器的频率为 50HZ,则纸带上相邻两点之间的时间间隔为_;光电门的工作原理是利用光源与光敏管相对,当

2、滑块经过时,其上的遮光条把光遮住,与光敏管相连的电子电路自动记录遮光时间的长短,该计时系统可以测出_的时间。【合作探究】-议 展 评探究一 实验:探究小车速度随时间变化的规律1.这个实验的操作步骤该怎么样呢?2.在这个实验中有哪些注意事项呢?3.如何处理纸带上的数据?【当堂检测】-检1. 运动的物体带动纸带被打点计时器打上一系列的点,这些点的距离不一定相等,但这些点2能说明 ( ) A 运动物体在一段时间内的位移 B 运动物体在一段时间内的运动快慢 C 运动物体在某时刻的位置 D 运动物体的运动性质 2. 某同学在做“探究小车速度随时间变化规律”的实验时,打点计时器所用电源的频率是,在实验中得到一条点迹清晰的纸带,他把某一点记作 ,再选依次相邻的 6 个点作为测量点,分别 和 ,如下图所示在做用打点计时器测速度的实验时,要用到打点计时器,打点计时器是一种计时仪器,其电源频率为 50Hz,常用的电磁打点计时器和电火花打点计时器使用的是 (直流电,交流电),它们是每隔 s 打一个点。如果测得 两点相距 , 两点相距 ,则在打 点时小车速度是 该同学分别算出打各点时小车的速度,然后根据数据在 坐标系中描点(如图所示),由此可求得小车的加速度

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