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3 cards from this section. Quick, good the night before a test.
Define instantaneous power.
Consider what happens at a snapshot during oscillation.
What is average power in SHM?
Think of it as energy transfer averaged out.
What is the formula for instantaneous power in SHM?
Think about the basic definition of power.
Average power varies with which factors?
Consider all components impacting energy.
A mass-spring system is driven by an external force with an amplitude of 5 N. If the amplitude of oscillation is 2 m, calculate the average power if the phase lag is 30 degrees.
Use cosine of the phase angle and plug into the average power formula.
Describe the effects of increasing the driving frequency on power absorption when approaching the natural frequency.
Consider what happens as you tune in a radio; the closer you get to the right frequency, the clearer the sound.
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