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Resonance

When a periodic force is applied to a system, the system undergoes forced oscillations.When the forcing frequency is equal to the natural frequency of the system, the amplitude of the oscillations becomes very large, and the periodic force is in phase with the velocity of the oscillating object and π/2 out of phase with the displacement.

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Specification: AQA Physics (7408), A-level, 3.6.1.4 Forced vibrations and resonance. Topic: Simple Harmonic Motion.

Key terms in this lesson

forced oscillation
An oscillation driven by a periodic external force, occurring at the frequency of that force rather than the system's natural frequency.

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