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Phase at resonance watch

1. I came across this online as I was looking at SHM documents :

The phase relationship between the driving oscillation and the the oscillation of the object being driven is different at different frequencies.
Below resonance they are in phase with each other.
At resonance the phase relationship is 90o or p/2 rad.
Above resonance the phase relationship is 180o or p rad.

How is this possible? I thought that at resonance they would be in phase, as applied freq = nay freq
2. (Original post by indignation)
I came across this online as I was looking at SHM documents :

The phase relationship between the driving oscillation and the the oscillation of the object being driven is different at different frequencies.
Below resonance they are in phase with each other.
At resonance the phase relationship is 90o or p/2 rad.
Above resonance the phase relationship is 180o or p rad.

How is this possible? I thought that at resonance they would be in phase, as applied freq = nay freq
Things can be oscillating at the same frequency but have different phases relative to each other.

Obv simple rules of thumb only describe the situation after a significant settling period, it needs time for the new phase relationship to establish after changing the driving frequency.

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Updated: February 3, 2016
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