Topic: Resonance.
How does sound break glass?
Obviously, using a hammer.
No.
It is because of resonance.
I know.
Resonance means to keep calm and balance.
No.
Wait, I will explain.
Every object when struck vibrates at its natural frequency.
If we make sound having a frequency which matches the object's natural frequency.
Then that object starts to vibrate.
This phenomenon is called resonance.
So, this was the reason why my legs started to move when the music system was switched on.
Just listen.
Every glass is made up of different materials.
However, all of them have a natural resonant frequency.
Hence, when we make sounds which match their resonant frequencies, the glasses start to vibrate.
As glass is a brittle material, louder the sound.
More violently will it vibrate causing the glass to shatter into pieces.