Video
Resonance is everywhere! From vibrating strings to making music with wine glasses, or even breaking them with sound, resonance is an interesting physical phenomenon.
Resonance is when an object vibrates at a certain frequency because of an external source that is driving the resonant vibration. Generally, these are frequencies that the object would naturally vibrate at. In the above video, the external source would be the speaker. Do you notice how the experimenter first tests the frequency of the wine glass by using a wet finger and moving around the rim of the glass? He does that to see what frequency the wine glass naturally vibrates at! Here is some cooler examples:
Wow! Who knew resonance was so beautiful! But it can be quite a disaster if you don't take in account for it:
Yikes! Physics is very powerful, and can describe many different phenomena in our world.