By Long Luo

挖坑

\[ m \frac {d^2x}{dt^2} = -kx \]

\[ m \frac{d^2x}{dt^2} = -k \cdot x = k \cdot A \sin \left( \omega t - \Delta \varphi \right) \]

\[ m \frac{d^2x}{dt^2} + m r \frac{dx}{dt} + kx = F(t) \]

参考文献

1. Oscillation
2. Simple harmonic motion
3. Electronic oscillator
4. Pendulum
5. Galileo Galilei
6. Damping