电动向心力公式验证演示仪的改进

Improvement of the Electric Centripetal Force Formula Verification Demonstrator

对向心力公式验证演示仪进行了改进,改进后的演示仪参照教材上验证向心力的实验方法,改用电机驱动使一质量已知的金属小球在细线带动下沿一水平面作匀速圆周运动,实验时通过更换不同材质的小球改变质量,通过调节细绳的长度或电机转速改变小球旋转半径,通过调节电机工作电压改变小球旋转角速度,利用控制变量法测出F与m、ω、R的对应关系,最后通过实验数据分析推导得出向心力公式F=mω~2R。改进后的实验装置操作方便,测量精度高,值得推广。

In view of the inadequacy of the existing centripetal force formula experimental device,the centripetal force formula verification demonstrator was improved.The improved demonstrator refers to the experimental method of verifying centripetal force on the teaching material,and uses a motor instead of a hand to make a metal ball of a known quality in the thin line.Drive the lower horizontal plane to make a uniform circular motion.During the experiment,change the mass by changing the ball of different materials,change the rotation radius of the ball by adjusting the length of the string or the motor speed,change the rotation angle of the ball by adjusting the working voltage of the motor,and use the control.The variable method measures the correspondence between F and m,ω,and R.Finally,the experimental data analysis leads to the centripetal force formula F=mω2R.The improved experimental device is easy to operate,and the measurement accuracy is high,which is worthy of promotion.