When you push someone on a swing you have to time your pushes to the time for the swing to move back and forth. By continually adding energy to the swing in small pushes, the size of the swing gradually builds up to a large amplitude. RESONANCE occurs when a series of small pushes with the right timing and causes an object to build up a large amount of energy.

Example: You may notice something vibrate loudly in your car only when driving a certain speed. At that speed the vibration from the engine is timed just right so that each vibration adds properly to the energy of the object, until it is vibrating with a large amplitude. At other speeds the timing isn't right and vibrations don't build up.

Adjustable Plaything
Aeolian Harp
Air Reed
AM Lightning
AM Radio
Big Drum
Circular Scales
Electromagnetic Spectrum
Frequency Excluder
Giant Guitar String
High and Low Q
Kettle Drum
Organ Pipe
Pendulum Table
Phase Pendulum
Piano Strings
Pipes of Pan
Resonant Bubble
Resonant Filament
Resonant Pendulum
Resonant Pendulum
Resonant Rings
Sound Column
Sound Sculpture
Tesla Coil & Barrels
Vibrating String
Violin Air Resonance
Violin Tone Color
Visible Effects of the Invisible
Vocal Vowels
Voice Trombone
Wave Machine
Wave Organ

Sound - Production
Wave Excitation

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