# Physics Course/Motion/Periodic Motion/Wave

## Water WaveEdit

### Concentric CirclesEdit

Concentric circles travels in a direction when there is a cobble drops on the water surface

${\displaystyle x^{2}+y^{2}=r^{2}}$
${\displaystyle Tan\theta ={\frac {y}{x}}}$

Which can be expressed as

${\displaystyle y(\theta )=rSin\theta }$
${\displaystyle x(\theta )=rCos\theta }$

### High Low WaveEdit

Water wave moves in a direction that changes its amplitude sinusoidally

${\displaystyle y(t)=rSin\omega t}$
${\displaystyle \omega ={\frac {\lambda }{t}}=\lambda f}$

With

${\displaystyle \lambda }$  : Wavelength . The distance between 2 crests (highest point)
${\displaystyle f}$  : Frequency . frequency of time to complete a cycle