利用手机传感器研究变化磁场中的单摆运动

Study on Pendulum Motion in Changing Magnetic Field Using Mobile Phone Sensor

利用手机传感器设计了两个单摆实验.在测重力加速度实验中,借助磁传感器记录随单摆做简谐运动的磁铁,其磁感应强度随时间变化的情况,测得单摆运动的周期并计算重力加速度.在此基础上,拓展设计了有磁场作用的单摆实验,借助光线传感器记录变化磁场中单摆周期的变化情况.这种创新的实验方法不仅能辅助实验教学,还能促进学生实践科学学习活动,是手机传感器应用在物理实验中的发展方向.

Two experiments for studying the motion of a simple pendulum are designed by using smartphone sensors.In the experiment of measuring gravity acceleration,the magnetic induction intensity of a magnet moving harmonically with a simple pendulum is recorded by a magnetic sensor.The period of the motion of a simple pendulum is measured and the gravity acceleration is calculated.On this basis,the experiment of a simple pendulum with magnetic field is developed and recorded by a light sensor.This innovative experimental method can not only assist experimental teaching,but also promote students′practical scientific learning activities.It is the development direction of smartphone sensor application in physical experiments.