Every single sound in our universe occurs because an object is moving back and forth—vibrating—extremely fast.
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When the clapper strikes the bell, it forces the solid metal body to warp and snap back instantly, sending sound waves radiating outward.
Plucking tightly stretched strings makes them snap back and forth, slicing through air molecules to generate sustained tones.
Striking the membrane creates compressed pockets of air inside the shell as the skin bounces down and up rapidly.