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# Relatively hard phy4 question [could turn up tomorow!!!] watch

1. 4. If an oscillating system is made to perform forced oscillations at a frequency close to its natural frequency, then resonance occurs. Describe how you could demonstrate qualitatively the meanings of the terms in italics.
Include a diagram of the apparatus you would use. [7]

7 marks woo
2. Signal Generator connected to a variable frequency vibration generator connected to a mass spring system. Oscillate the mass-spring system a set number of oscillations counting from the centre point and divide by the time in order to get the period. Calculate the naturnal frequency by doing 1/T. Force the system to oscillate using the vibration generator and bring the frequency to the natural frequency of the system. Large amplitude oscillations will occur as the system is being forced to vibrate at its natural frequency - resonance.
3. I just did this! Its a beast.

oscillator dangling a mass spring system...

-observe natural frequency of system with oscillator off
-switch signal generator on and vary f, the forced oscillations, where the oscillator drives the mass spring system
-at the natural frequency the amplitude maximum is much greater than therwise
-this is resonance
4. so......what 'terms in italics' would these be?
5. Could you do this using Bartons Pendulum? and measure the lengths of various strings? I was half wondering...
6. no...dont use bartons pendulums...u will not get full marks....best to use mass-spring system...its easy to remember anyway...

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