The different thread pendulums have different thread lengths.[br]However, the period of oscillation and the frequency of the pendulum depend on the length of the pendulum.[br][math]\omega=\sqrt{\frac{g}{l}}[/math] bzw. [math]f=\frac{1}{2\pi}\cdot\sqrt{\frac{g}{l}}[/math] circular frequency [math]\omega[/math] und frequency f (in [math]\frac{1}{s}[/math]), acceleration due to gravity [math]g\approx9,81\frac{m}{s^2}[/math][br][math]T=2\pi\cdot\sqrt{\frac{l}{g}}[/math] period of oscillation T (in s)