unit 5 resonance

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  • Created by: megan
  • Created on: 24-03-13 16:55
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  • Oscillations
    • Free and Forced Oscillations
      • Releasing a pendulum and letting it swing  freely is a free oscillation.
      • Any oscillating system has a natural frequency
      • By repeated application of force you could force the pendulum to oscillate at a different frequency
        • This is a forced oscillation and the frequency you cause it to be is the driving frequency
      • Forced oscillations involve adding energy to a system whilst it oscillates
        • Unless this is done at the natural frequency, SHM will not take place and the system will dissipate energy quickly
    • Damped oscillations
      • Damped oscillations suffer a loss in energy in each oscillation which reduces the amplitude over time.
      • a system performing SHM at its natural frequency may sill dissipate energy through a friction force
      • The amount of damping will change how quickly the amplitude is reduced.
      • Critical damping = the oscillator returns to is equilibrium position in the quickest time possible
    • Resonance
      • If a system is forced to vibrate at its natural frequency, it will adsorb more and more energy which increases the amplitude of the oscillation
      • Some objects have several natural frequencies
      • Damping systems are used to reduce resonance
      • As the driving frequency applied to an oscillating system changes, it will pass through natural frequencies of the system which cause large amplitude vibrations


Mrs Jones

A really clear outline of Simple Harmonic Motion (SHM), damping and resonance.  I'd print it off and add diagrams & equations. Useful to refer to and add more information to when doing past paper questions.

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