Resonance
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Resonance is an effect that causes a system to retain energy
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Blowing on the mouth of a bottle makes a tone
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A flute or organ pipe uses this effect to produce music
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The physical size of the woodwind instrument, water bottle etc. determines the frequency of the resonance, and so is tuned to produce the sound you hear
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An antenna is tuned to the frequency of a TV, radio station, cellphone or satellite transmission
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The resonant system requires input of energy to build up and maintain the resonance.
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Friction is the opposing force that reduces the energy stored in the system
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