Ping-Pong Ball in Air Stream
The ball floats and follows the tilted air stream.
Teaching & key ideas
What you do: Point dryer upward and place ball in the stream; tilt slightly.
What students see: The ball floats and follows the tilted air stream.
Why it works: Fast moving air and surrounding pressure keep the ball centered.
Question to ask: Why doesn't the ball blow away?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why doesn't the ball blow away?