Once upon a time, people used record players to hear music. Records were these big black discs that played on a machine. Spinning between 33 and 45 times per minute on a turntable, people used to listened to music just like this for nearly a century.

Edison, who had trouble hearing, used to bite down hard on the side of his wooden record player (called a phonograph) and “hear” the music as it vibrated his jaw.

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Here’s what you need:

• an old turntable (do you have one in your garage?)
• old record that can be scratched
• tack
• plastic container, like a clean yogurt or butter tub

If you have an old turntable and OLD record that can be scratched, here’s how to listen to the music without using regular speakers!

Yay! You’ve completed this set of lessons! Now it’s your turn to do physics problems on your own.

Download your Sound Problem Set here.

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