摘要
在物理学科领域中,重力加速度g是重要参数,它对地球上及邻近空间范围内发生众多物理现象存在制约影响.文章提出运用基于自由落体法粘滞系数测定仪对重力加速度进行测定,准确测量重力加速度对确定物理量存在深刻实际意义.以自由落体定律为基础,运用光电计时法测量小球下降过程中所用时间,考虑自由落体下降位移对重力加速度影响,在自由落体小球直径一定情况下,通过调整下降测量距离h测减小实验数据误差;考虑空气阻力的影响,通过增加自由落体小球质量减小体积并设定小球下降适宜位移值,从空气阻力方面减小实验数据误差.根据上述实验条件,对粘质系数测定仪进行改进,运用激光光电传感器与单片机计时器结合,使用严格平行激光光束,对自由落体小球进行精确测量并获取准确重力加速度数据.
In the field of physics,gravity acceleration g is an important parameter,and it has a restricted influence on many physical phenomena on the earth and in the vicinity of the space.In this paper,it is put forward that the measurement of gravitational acceleration based on the method of measuring viscosity coefficient of free falling body and the accurate measurement of gravitational acceleration are of great practical significance in determining physical quantities.The law of free fall as the foundation,use time measuring ball photoelectricity timing method in the process of decline,consider a free fall impact displacement of the gravity acceleration,the free falling ball diameter under certain circumstances,by adjusting the decline of measuring distance h experimental data measured to reduce error.Considering the influence of the air resistance,by increasing the free falling ball quality reduce the volume and set the ball down for displacement,reduce the error of experimental data from the air resistance.According to the above experimental conditions,the viscosity coefficient measuring instrument is improved,and the laser light sensor is combined with the microcontroller timer,and the laser beam is measured by the strict parallel laser beam,and the accurate gravity acceleration data is obtained.
作者
朱兴伟
ZHU Xingwei(Department of Basic,Anhui Medical College,Hefei 230601,China)
出处
《太原师范学院学报（自然科学版）》
2021年第3期70-74,共5页
Journal of Taiyuan Normal University:Natural Science Edition
关键词
物理学
自由落体
粘滞系数
重力加速度
physics
free falling body
coefficient of viscosity
acceleration of gravity
