3 vectors and scalar
20 damped harmonic motion,forced harmonic motion, superposition of SHM
damped harmonic motion
underdamped motion:欠阻尼
critical damped零界阻尼
over damped过阻尼
energy of damped harmonic motion
application of damped oscillation:减震器
forced oscillation
resonance
superposition of SHM
superposition in 2D
nature of light
definition
speed of light
reflection
dispersion
huygens's principle:惠更斯原理