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# Forced vibrations question watch

1. In my textbook it states "as applied frequency increases, the phase difference between the displacement and the periodic force increases from 0 to pi/2 at the maximum amplitude, and then from pi/2 to pi as the frequency increases further".
I don't understand what this means. Which graphs does this refer to?
2. (Original post by IDontKnowReally)
In my textbook it states "as applied frequency increases, the phase difference between the displacement and the periodic force increases from 0 to pi/2 at the maximum amplitude, and then from pi/2 to pi as the frequency increases further".
I don't understand what this means. Which graphs does this refer to?
The time-varying force that is applied and the dynamical response of your system can be represented by a plot of amplitude vs phase or time.
3. (Original post by IDontKnowReally)
In my textbook it states "as applied frequency increases, the phase difference between the displacement and the periodic force increases from 0 to pi/2 at the maximum amplitude, and then from pi/2 to pi as the frequency increases further".
I don't understand what this means. Which graphs does this refer to?

It refers to the graph on the right. Note the applied frequency is normalized with natural frequency .

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