Ruler Guitar Pitch
Shorter lengths vibrate faster and sound higher.
Teaching & key ideas
What you do: Hold different lengths of ruler over the edge and pluck.
What students see: Shorter lengths vibrate faster and sound higher.
Why it works: Vibration frequency determines pitch.
Question to ask: What changes when less ruler sticks out?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What changes when less ruler sticks out?