1Two things to know first
Every glass has a note it loves to ring at
Tap a glass and it sings one note — its own special pitch. And a wobble only grows if every push lands at just the right moment. Watch each idea wiggle:
Its own ring
Ping a glass and it rings one pitch. That note is baked into its shape — like a tiny bell hiding in the glass.
Pushes that add up
Like pushing a swing. Push in time and it swings higher and higher. Push at the wrong time and it just jiggles.
2The two notes
A matched note vs an off note
Both notes are sung just as loud. The only difference is the pitch — and that changes everything. Here's a quick look at each:
Sung right on the glass's own pitch. Each push lands in time, so the wobble stacks up bigger and bigger.
A different pitch — even a loud low one. Pushes arrive out of step and fight the wobble, so it stays small.
3Your turn — be the singer
Slide your pitch and hunt for the glass's note
Tap to ping the glass and hear its note. Then slide your singing pitch up and down. Watch the rim wobble harder the closer you get to its secret pitch.
4Now try to break it
Same pitch. Two strengths.
Now both singers match this glass's ringing pitch. One sings softly; the other produces a stronger sound. Both keep singing for the same time. The glass loses a little vibration energy each moment.
Guess before you find out
Both notes match the glass. Will both make it break eventually, or can the soft note settle at a small wobble while the stronger one breaks it?