# Pendulum

We can work out the time taken for one full oscillation (for example, swinging from left to right and back to left). We shall call this time ${\displaystyle T}$ the period. If the pendulum length is ${\displaystyle L}$, and the acceleration due to gravity is ${\displaystyle g}$, then:
${\displaystyle T\approx 2\pi {\sqrt {\frac {L}{g}}}}$