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EXEnergy transfer becomes most efficient when the frequency of a driving force matches the natural frequency of a system — a phenomenon known as resonance. At this point, even a small input of energy can produce a large response because the system vibrates in sync with the applied force. This principle explains how a swing moves higher with properly timed pushes, how musical instruments amplify sound, and how tuning circuits in electronics work. When frequencies do not match, energy is still transferred, but much less efficiently.
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