EthioKids · Grade 4 · 4-PS3 / 4-PS4 / 4-LS1 / 4-ESS2 / 3-5-ETS1
Sound Vibration
Grade 4 · Science Discovery
Predict · Test · Explain
Science Discovery Lab · 4-PS4-1
Predict · Test · Explain
🔎 Investigation question
Test how the free length of a vibrating ruler changes pitch.
A ruler hangs partly off a desk. When plucked, it vibrates and makes sound. Shortening the overhanging length changes the pitch.
Challenge 1 · Predict
Which setup will usually vibrate at a higher pitch?
🧪 Experiment station
Choose a setup and run the model
Long vibrating section
📋 Lab observations
Make a prediction, then run this setup to observe the outcome.
Comparison bars show illustrative relative results, not live laboratory measurements.
Challenge 2 · Explain with evidence
Which observation matches this comparison?
Run both setups to unlock this evidence challenge.
🦁 Science coach
Relative pitch is represented schematically; no sound is generated.
Science Lab practice is formative: it does not award stars or mark a lesson complete. Graded questions follow below.
🔬 Evidence skill check 1 of 3
What produces the sound?
Sound Vibration