Normal mode of coupled harmonic oscillator is obtained by means of algebra, the procedure is simple and the physical meaning is clear.
本文用代数的方法求出了耦合谐振子的简正模，过程简单且物理意义清晰。
2
Using smooth guides, spring oscillator and high brightness LED, a simple method of demonstrating Lissajous figure is introduced.
介绍了利用光滑导轨、弹簧振子、高亮发光二极管演示李萨如图形的方法。
3
The method to measure body's inertial mass is proposed by measuring period of vibration with the integrated hall switch sensor, when spring oscillator is in situation of simple harmonic vibration.