用落球法测液体的粘滞系数实验中计时起点的确定

讨论了用落球法测液体粘滞系数实验中计时起点的确定依据,分别从钢球下落距离与速度的关系和钢球下落时间与速度的关系两个不同的角度展开讨论,在实验要求精度范围内,两种方法结果相同.在实验教学中引进这两种方法,能增强学生运用已有知识分析问题、解决问题的能力,加强学生基础知识之间的横向联系,同时为实验教学提供理论依据.

Defining starting time in the experiments of fall-ball method to measure the coefficient of viscous liquids

By studying the relation between distance and velocity of the falling iron-ball as well as the relation between time and velocity of the falling iron-ball,this paper discussed the basis of defining the starting time in the experiments of fall-ball method to measure the coefficient of viscous liquids.The results show that the two metnods are of similar effects under conditions of precise experiments.Introducing these two methods into experiment teaching can strengthen students' ability of problem analysis and solution and provide the theoretical basis for experimental teaching.