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String Telephone Physics
Build a simple string telephone and test conditions that affect sound transmission.
6–1220–35 minFree to usePrintable page
You will need
Two paper cups, string, safe tool for holes with adult help
Investigation
What to do
1
Connect two cups with a taut string.
2
Speak while a partner listens.
3
Repeat with slack string.
4
Try touching the string midway.
5
Compare what changes and explain using vibration.
Science thinking
What this develops
Sound, vibration, transmission and fair comparisons.
Safety first
Use age-appropriate supervision and safe materials. Stop any activity that is unsuitable for the learner or environment. These resources are educational activities, not professional laboratory, medical or safety instructions.
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