Resonance

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Resonance
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Bartons pendulums

• Observe the Bartons pendulums
• Write down two observations.

3

• Resonance occurs when the frequency of the
  driving force matches the natural frequency of
  the oscillating body.
• When this occurs a large amplitude vibration is
  observed.

4
Bridge resonance

• Tacoma Narrows bridge disaster

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• The Millenium Bridge, a foot bridge in London
  oscillated alarmingly when first opened.
• This is illustrated in the video clip
• video
• The bridge had to be closed and modified to
  eliminate these oscillations

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Resonance of a helicopter

• Chinook ground test

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• Rice on a vibrating plate
• Note the plate has many resonant frequencies, you
  will notice the amplitude increase at each of
  these different modes of vibration.

8
Can you break a glass by singing?

• Breaking glass?

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Microwave cooking 2.4Ghz
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MRI Scans