测出的g值为何误差这么大

• 作 者: 吴惟德
• 机 构: 九江师专附中,
• 出 处: 物理教学
• 发表日期: 1989年07期
• 关键词: 打点计时器 逐差法 匀加速运动 处理方法 数据处理过程 偏差值 高中物理 点迹 值分布 额定工作电压

自由落体运动是最常见和易做的匀加速运动,不少学校是用打点计时器测重力加速度g的值。一般说,测得的g值应相当准确,但我们在指导学生实验时发现,所测得的g值误差相当大。下表为某班学生60人实验结果的统计。纸带处理方法为高中物理(乙种本)介绍的自然计数点,△n=3的逐差法。

Free-fall body movement is the most common and easy uniform acceleration movement. Many schools use the tick timer to measure the value of the acceleration g. In general, the measured g-value should be quite accurate, but we found that when the student was instructed in the experiment, the measured g-value was quite large. The following table shows the statistics of the experimental results of 60 students in a class. The paper tape processing method is the natural counting point introduced by high school physics (the B type), and the method of Δn=3 by the difference method.