Resonance

Bartons pendulums

Observe the Barton’s pendulums

Write down two observations.

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.

Bridge resonanceTacoma Narrows bridge disaster

The “Millenium Bridge”, a foot bridge in London oscillated alarmingly when first opened.

This is illustrated in the video clipvideoThe bridge had to be closed and modified to

eliminate these oscillations

Resonance of a helicopter

Chinook ground test

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.

Can you break a glass by singing?

Breaking glass?

Microwave cooking 2.4Ghz

MRI Scans