I. Guiding Question: Determine how changing amplitude and frequency can change how a sound is perceived.
II. Hypothesis: I think that when the rubber band is plucked the amplitude and frequency will change the sound a lot. When the amplitude becomes higher then I think the sound will be much deeper and maybe even more muffled because of the vibrations and the top of the rubber band hitting the bottom. When the amplitude is lower I think the pitch will be much higher but the sound will also be quieter.
III. Exploration:
Materials:
thin, thick, long, and small rubber bands, partner
Procedure:
1.
Have 2 partners each hold one end of the thicker rubber band, pull until the rubber band is not loose.
2. Pull the rubber band 1 cm away from the middle. Let it go. How far does the band move? (1 cm) Describe the sound you hear in the table below.
3. Repeat step 2 four more times. Each time, pull the band back further. Describe how the sound changes each time in the chart below.
IV. Record & Analyze:
Experiment 1:
V. Conclusion:
1. How did the sound change when you changed the amplitude?
When I changed the amplitude it became a higher pitch up to a certain point where the vibrations would hit the bottom of the rubber band and completely stop the sound.
2. What happened when you changed the thickness, length, and tightness of the rubber band?
The thickness of the rubber band changed mostly the pitch, making it very much lower. When the length was shorter it would be a higher pitch but a shorter sound. When it was longer it would be a lower pitch and last much longer. The tighter the rubber band was the higehr the pitch would be.
II. Hypothesis: I think that when the rubber band is plucked the amplitude and frequency will change the sound a lot. When the amplitude becomes higher then I think the sound will be much deeper and maybe even more muffled because of the vibrations and the top of the rubber band hitting the bottom. When the amplitude is lower I think the pitch will be much higher but the sound will also be quieter.
III. Exploration:
Materials:
thin, thick, long, and small rubber bands, partner
Procedure:
1.
Have 2 partners each hold one end of the thicker rubber band, pull until the rubber band is not loose.
2. Pull the rubber band 1 cm away from the middle. Let it go. How far does the band move? (1 cm) Describe the sound you hear in the table below.
3. Repeat step 2 four more times. Each time, pull the band back further. Describe how the sound changes each time in the chart below.
IV. Record & Analyze:
Experiment 1:
| Distance Away from Middle | Description of Sound |
1 cm | Low, quite pitch |
2 cm | Higher, louder |
3 cm | high pitch, very quiet |
4 cm | low pitch, very quiet |
5 cm | short, low pitch |
| Thickness of Rubber Band | Description of Sound |
Thick | low pitch |
Thin | quiet, high pitch |
| Tightness of Rubber Band | Description of Sound |
| Loose | almost no sound |
| Tight | high pitch |
| Tightest | louder high pitch |
| Length of Rubber Band | Description of Sound |
Longest | Low pitch |
Long | short low pitch |
Short | quit high pitched |
V. Conclusion:
1. How did the sound change when you changed the amplitude?
When I changed the amplitude it became a higher pitch up to a certain point where the vibrations would hit the bottom of the rubber band and completely stop the sound.
2. What happened when you changed the thickness, length, and tightness of the rubber band?
The thickness of the rubber band changed mostly the pitch, making it very much lower. When the length was shorter it would be a higher pitch but a shorter sound. When it was longer it would be a lower pitch and last much longer. The tighter the rubber band was the higehr the pitch would be.
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