Question

Give any two real life example for coupled pendulum

Answer 1

Seismometers

Earthquakes are notoriously difficult to predict, but scientists as far back as the first century tried their best with the help of pendulums in seismometers. One of the first known pendulums at work was found in a seismometer from the Han Dynasty. Then, as today, seismometers measure seismic activity in the ground. The pendulum in the seismometer found from the first century activated a series of levers that directed a small ball to fall out of one of the instrument’s eight holes. That way, ancient scientists hoped to know from which direction the earthquake was coming.

Metronomes

Reading music depends heavily on being able to play to a certain beat, but beginner musicians sometimes have trouble keeping that beat regular in their heads. They are often encouraged to use a metronome, a device that emits a click or a light for each beat of a predetermined interval with the help of a pendulum. Some metronomes also have a visual element, so a musician can look at the metronome's pendulum as if they were looking at a conductor’s wand to keep their beat steady. If musicians need to focus on a new interval, they can adjust the length of a pendulum to their desired beat.

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