用传感器探究影响向心力大小因素的实验装置研究

Experimental Studies with a Sensor Device to Explore the Factors Which will Affecting the Magnitude of Centripetal Force

实验探究向心力F的大小与质量m、角速度ω和半径r之间的关系是高中物理的一个重要实验。针对传统实验装置存在的不足,新设计的实验装置利用PASCO力传感器测向心力的大小,用调速电机来改变金属小球作圆周运动的角速度,并用霍尔传感器测量电机的转速,金属小球的质量和小球的旋转半径则定量改变。新的实验装置能定量地探究向心力的大小F与质量m、角速度ω和半径r之间的关系,实验结果精确度高,演示效果明显,方便师生使用和操作,值得推广。

Using experimental to find out the relations of the Magnitude of Centripetal Force among Mass （ m） ,Angular Velocity （ ω） and Radius（ r） is a very important experimental in High School’ s Physics. Due to the shortages of old lab equipment,the new equipment designed with a PASCO Force Sensor to measure the Magnitude of Centripetal Force,Variable Speed Motors also applied in order to change the Angular Velocity of Metal Pellets during circular motion,and measure the speed of Motor through Hall Sensors,the mass and rota-ting radius of small metal balls become quantitative changes. New equipment are quantitatively capable to ex-plore the relations of the Magnitude （ F ） of Centripetal Force among Mass （ m ） , Angular Velocity （ ω） and Radius （ r） ,the experimental results are accuracy,demonstrate effectively,teachers and students could operate easily,it is worth promoting.