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Vibrations and Waves

Vibrations and Waves. Energy transfer. A Pendulum. Vibrations in time = waves Types of waves Water Sound Light Radio “the wave”. Simple harmonic motion Waves Vibrations in time Back and forth. Pendulum example. Frequency f =1/T Cycles per time

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Vibrations and Waves

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  1. Vibrations and Waves Energy transfer

  2. A Pendulum • Vibrations in time = waves • Types of waves • Water • Sound • Light • Radio • “the wave” Simple harmonic motion Waves Vibrations in time Back and forth

  3. Pendulum example • Frequency • f=1/T • Cycles per time • Unit = cycles per second or hertz (Hz) • Period • T=2π√ • T=1/f • Time per cycle • Unit = seconds L g Inverse Relationship

  4. Terms to know regarding simple harmonic motion: • Trough and crest • Amplitude • Wavelength • Period • Frequency • Medium • Sine curve

  5. Wave speed • v=λf • Depends on the medium through which a wave is traveling • Sound waves for example • Relationship between wavelength, frequency and wave speed Sound Waves

  6. Transverse and Longitudinal Waves • Transverse • Sine curve • Direction of wave and motion of medium perpendicular • Electromagnetic waves • “the wave” • Longitudinal • Slinky • Direction of wave and motion of medium parallel • Sound waves

  7. Interference • Constructive and Destructive

  8. Standing Wave • Standing waves are the result of interference. Think of 2 waves passing through each other in opposite directions. • Microwave oven • What happens as you increase the frequency? • How could you increase the wavelength? • Guitar • B=nodes • A=antinodes

  9. Doppler Effect • Show Doppler sound • Research Doppler radar • pictures

  10. Hooke’s Law

  11. Hooke’s Law • The restoring force of a spring is proportional to the displacement through which it is stretched or compressed.

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