Why Does a Tuning Fork Sound Louder When You Touch It to a Table?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does a tuning fork sound louder when you touch it to a table?

The Big Idea

A tuning fork sounds louder on a table because the whole tabletop shakes with it! A fork alone pushes only a tiny bit of air. A big flat surface pushes much more air, so you hear a louder sound.

Fork Alone

Step one: the fork alone is quiet. Its thin prongs slip through the air and push very little of it. So the sound it makes is soft.

Table Shakes

Step two: touch it to the table. The vibration passes into the wood, and the whole tabletop shakes along. A big flat surface moves much more air.

Louder, But Shorter

Step three: louder, but shorter. The fork gives energy to the table faster, so the sound is louder. That also means it dies away sooner.

A Closer Look

Let's take a closer look! The fork is small and thin. The tabletop is large and flat. When it shakes, it moves much more air. So the sound you hear is louder.

Quick Facts

Quick facts! The table works like a speaker for the fork. Guitars and violins use hollow bodies the same way. Louder sound uses up the fork's energy faster. Never put electric toothbrushes or tools in your mouth or near your ears.

Think Like a Scientist

Now, try this! With a grown-up, hold the base of a running electric toothbrush on a wooden table, and then in the air. Listen to the buzz each time. Which is louder? Do not put it in your mouth. Share what you discover with a grown-up.

Outro

A table makes a small sound bigger. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!