Physics of Sound Investigation 2, Part 3
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Transcript of Physics of Sound Investigation 2, Part 3
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Physics of SoundInvestigation 2, Part 3
Tension and Pitch
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Materials
Student sheet no. 11 called The Minigutbucket Student sheet no. 12 called The FOSS-ulele Large plastic bags Small nail Scissors Metric tape 2 Plastic cups 50 cm string 3 large paper clips Pencil 250 cm string Masking tape
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Minigutbucket (for teacher)
Insert string through hole in plastic cup.
Tie a knot at the end of the string.Tie the opposite end of the string
around a chair or table leg.
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FOSS-ulele (for teacher)
Place a plastic cup upside down on a table.
Tie one end of the string to a table leg.
Feed the string through the plastic cup.
Tie a pencil to the other end of the string.
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Introduction
What is tension? (A force pulling on an object in opposite directions.)
How does tension affect pitch?
Will find out by exploring 2 instruments.
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Instruments
5 minutes to explore
Minigutbucket Demonstrate how attaches to a table leg. Show how to apply tension to the string by pulling
gently but firmly on the cup.
FOSS-ulele Demonstrate how to use the paper clip to affix the
string to a table let, bring the string across the cup on top of the table, and use the pencil like a handle to apply tension to the string.
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Student sheets
Distribute
Read instructions
Record observations
Describe the methods used to change the pitch.
How did you change the tension of the strings on the 2 instruments?
What happened to the pitch of the sound produced by the string as you changed the tension o the strings?
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Review
Tension – force applied to an object trying to pull it apart
What happens t the pitch when the tension on a sound source changes? (The greater the tension on a sound source, the higher the pitch.)
Science Story – Scoping out Sound
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The End!!!