Why Does a Stadium Wave Move Across the Crowd While the People Stay Put?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does a stadium wave move across the crowd while the people stay put?

The Big Idea

In a stadium wave, the wave travels while the people stay in their seats! Each person stands up and sits down in turn. That shows that a wave moves energy, not the things it passes through.

One Person Stands

Step one: one person stands. A few people stand up and cheer, then sit back down. Their neighbors see it and join in, one after another.

Neighbors Follow

Step two: neighbors follow. Each person copies the person next to them, one after another. The pattern runs around the stadium, but nobody leaves their seat.

Sound Does It Too

Step three: sound does the same. Air particles only jiggle back and forth a little, like the people in their seats. The sound wave still travels all the way to your ear.

A Closer Look

Let's take a closer look! Each person rises for just a moment. Then they sit back down in the same seat. Meanwhile the wave races around the stadium, passing energy from person to person. Waves carry energy and information, not matter.

Quick Facts

Quick facts! Waves carry energy and information, not matter. Ocean waves move along while the water mostly bobs in place. Sound carries messages, like words and music, to your ears. Cheer happily, but save your voice, and keep a comfortable volume.

Think Like a Scientist

Now, challenge! With friends or family in a row or a circle, do a wave. Each person raises their arms in turn. Who moves? Who stays put? What is the wave carrying? Share what you discover with a grown-up.

Outro

A wave moves, but the people stay put. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!