This simple sound experiment from San Francisco's Exploratorium lets your students experiment with sound—without making a lot of noise. Each student will need a piece of string or yarn that’s at least 3 feet (1 meter) long. Students can work on their own, but we suggest students work in pairs so they can discuss their ideas with one another.
Follow the instructions here. Encourage students to experiment to figure out how to change the sound. (They can make it higher by pulling the string tighter and lower by loosening the string.)
Lesson Assessment : Open-ended drawing/writing prompt
Activity: Find more vibrations in these simple sound experiments from San Francisco's Exploratorium.
If you enjoyed Head Harp and want to continue experimenting, here are two more simple sound experiments from San Francisco's Exploratorium.
Secret Bells makes sounds only you can hear! You'll need string, scissors, and an unpainted wire clothes hanger.
Set your classroom buzzing with Bee Hummer, a simple instrument that sounds like a swarm of bees.