# L40 - Remember:ThisWeek FCQ Do it on-line CAPA...

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Remember: This Week FCQ: Do it on-line. CAPA assignment #14 is due Friday evening at 10 PM, to be done on-line. Read: Ch. 11: Vibrations and Waves. Ch. 11.1-11.4, 11.7, 11.8, 11.11-11.13. Also Ch. 12.1 &12.4 on sound waves. FINAL EXAM: TWO WEEKS FROM THIS TODAY! Wednesday May 5, G1B20 & G1B30, 4:30 – 7:00 PM L40 W 4/21/10 1 Physics 2010

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L40 W 4/21/10 Physics 2010 2 Waves in Nature
L40 W 4/21/10 Physics 2010 3 Simple Harmonic Oscillator F = ma = kx (Hooke's Law)

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L40 W 4/21/10 Physics 2010 4 A ball bounces up and down on a floor with perfectly elastic bounces, so that the ball bounces forever. Is this an example of simple harmonic motion? A) Yes The force is constant, it’s not dependent on displacement.
L40 W 4/21/10 Physics 2010 5 Simple Harmonic Oscillator F = ma = kx (Hooke's Law) Qualitative Comments: restoring force is proportional to displacement force is not constant, so acceleration isn’t either: a = -(k/m)x “amplitude” A is the maximum displacement x max , occurs with v = 0 mass oscillates between x = A & x = -A maximum speed v max occurs

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