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A LevelPhysicsEdexcelExam Questions13. OscillationsResonance

Resonance (Edexcel A Level Physics)

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A damped mass-spring system is driven into oscillation. The graph shows the amplitude of oscillation as the driving frequency is varied.

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The damping is decreased.

Which row of the table describes what happens to the maximum amplitude of oscillation and the driving frequency at which this occurs?

  Maximum amplitude Frequency at which maximum amplitude occurs
A decreases decreases
B decreases increases
C increases decreases
D increases increases

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    1
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    When a car driver is driving, they notice a periodic force is applied to their lightly damped rear-view mirror causing it to oscillate. 

    The graph shows how the amplitude, A, of the oscillations varies with the frequency, f, of the periodic force.

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    Which one of the following statements best describes how the shape of the curve would differ if the damping on the rear-view mirror was greater?

    • The curve would be lower at all frequencies

    • The curve would be higher at all frequencies

    • The curve would be unchanged except at frequencies above the resonant frequency where it would be lower

    • The curve would be unchanged except at frequencies above the resonant frequency where it would be higher

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    2
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    Which of the following graphs shows the correct variation of displacement, y, of an object undergoing lightly damped oscillations against time, t ?

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      3
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      A mechanical oscillator is set into motion by a periodic driving force whose frequency is steadily increased from a low value. 

      Which of the following is correct for this system?

      • The oscillator is subject to damping only at the resonant frequency

      • Forced vibrations occur only at particular frequencies

      • The oscillator will not continue to resonate when the periodic driving force is removed

      • When resonance occurs the damping force is a minimum

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