Ruch drgający

$x (t) = A \sin (ω t + φ)$

$v_{x} (t) = A ω \cos (ω t + φ)$

$a_{x} (t) = - A ω^{2} \sin (ω t + φ)$

$F_{x} (t) = - m A ω^{2} \sin (ω t + φ)$

$T = 2 π \sqrt{\frac{l}{g}}$

$T = 2 π \sqrt{\frac{m}{k}}$