Resonance of Pendulum

Resonance of Pendulum

Resonance of Pendulum

Every pendulum has a natural or resonant frequency, which is the number of times it swings back and forth per second. The resonant frequency depends on the pendulum’s length. Longer pendulums have lower frequencies. Every time the first pendulum swings, it pulls on the connecting string and gives the second pendulum a small tug.

Since the two pendulums have the same length, the pulls of the first pendulum on the second occur exactly at the natural frequency of the second pendulum, and so it (the second pendulum) begins to swing too.