Groovy Guitar experiment

Name: ________________________________ Date: ___________



INTRODUCTION

A sound with higher pitch is caused by vibrations that are fast. A sound with lower pitch is caused by vibrations that are slow. The size of an object helps to determine if it will vibrate fast or slow and therefore its pitch.

WHAT YOU NEED

  • 1 skinny rubber band
  • 1 milk carton
  • 1 fat rubber band
  • 2 pencils

WHAT YOU DO

1. Put the rubber bands around the milk carton the long way.

2. Put one pencil under the rubber bands near each end of the carton.


3. Pluck the skinny rubber band and listen.

4. Now pluck the fat rubber band and listen. Does the skinny rubber band have a higher or lower pitch than the fat one?

____ Higher

____ Lower

5. Pluck the rubber bands again and watch them vibrate. Does the whole rubber band vibrate or just the part between the pencils?

____ The whole rubber band

____ Just the part between the pencils

6. Let's try making the length between the pencils shorter. First, pluck the skinny rubber band again and remember its sound. Move one of the pencils to the middle of the carton. Pluck the skinny rubber band again. Is the new sound higher or lower in pitch?

____ Higher

____ Lower

CONCLUSION

Look at your results in the last two steps and complete this sentence:

An object that is long or fat will have a pitch that is ______________ (higher/lower) than an object that is skinny or short.



Last Update: May 5, 1996

Copyright 1996, D.M.Candelora. All rights reserved. Reproduction for educational use is encouraged as long as this copyright notice is included.