Good vibrations
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  • 1. Good Vibrations By Chelsea Ziliak 2/20/2010
  • 2. Science Standard 3 The Physical Setting
    • Indicator 3.3.9- Demonstrate that things that make sound do so by vibrating, such as vocal cords and musical instruments.
    • Taken from:
    • Link to activity:
  • 3. Definitions
    • Vibrations-
      • A rapid linear motion of a particle or of an elastic solid about an equilibrium position.
  • 4. Background Information
    • Usually a vibrating string produces a sound whose frequency in most cases is constant. Therefore, since frequency characterizes the pitch , the sound produced is a constant note . Vibrating strings are the basis of any string instrument like guitar , cello , or piano .
  • 5. Materials
    • Comb
    • Wax Paper
    • Box
    • Rubber bands
  • 6. Pre-Activity
    • 1. Place fingers on throat. Make high sound, low sound, then say your name in a normal tone.
    • 2. What did you feel?
    • 3. When is a time that you think you may have felt vibrations of a sound?
  • 7. Harmonicas
    • Take comb and piece of waxed paper
    • Fold wax paper over comb.
    • Play your harmonica by pressing your lips lightly against the paper and humming musical scales.
    • Experiment with different scales.
    • What caused the noise?
  • 8. Rubber Band
    • Take rubber bands and shoebox.
    • Stretch rubber bands around shoebox.
    • Carefully pluck different rubber bands.
    • What types of sounds do you hear?
    • Watch the vibrations of the rubber bands.
    • Compare the sounds of the harmonica and the sounds of the rubber bands being plucked.
  • 9. Compare/Contrast Chart
  • 10. Assessment
    • What makes sound?
    • Rubber bands
    • Vibrations
    • Air moving
    • Instruments