Imagine life is a game in which you are juggling five balls. The balls are called work, family, health, friends and integrity. You keep all of them in the air. But one day you finally come to understand that work is a rubber ball. If you drop it, it will bounce back. The other four balls are made of glass. If you drop one of these, it will be irrevocably scuffed, nicked, perhaps even shattered.
(from Suzanne’s Diary for Nicholas by James Patterson)
(Image source: http://atte-1.deviantart.com/art/J-for-Juggle-165261440)
The power of vibration is incredible. Vibration allows a microwave to heat food and causes cities to be destroyed by earthquakes. The most interesting feature of vibrations is resonance, where a vibration of certain frequency greatly amplifies the vibration of another object. Every object has a natural oscillating frequency and when another wave of the same frequency hits the object, the oscillation suddenly amplifies and resonance occurs.
The best example for resonance is a swing. If you push a person on a swing at the same frequency as the swing’s natural frequency, you can achieve a much greater height than from pushing at any other frequency. Resonance can also be used to shatter a glass with only sound, by singing a sustained note at the same frequency as the glass’ natural frequency.
Resonance is how two things combine to create an even greater force.
1 + 1 = 3