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Investigation: Four Variables, One Method

What the Ramp Is Made Of

Check Your Understanding: Transfer of the Rule

Heavy and Light

Check Your Understanding: Inconsistent Trials

Long Ramps and Short Ramps

Check Your Understanding: Two Fair Tests

Crash! Transferring Motion

Check Your Understanding: The Gentle Challenge

Lessons 4–7: children test surfaces, weight, and ramp length as controlled variables, then send rolling objects crashing into targets to investigate collision and transferred force.

The investigation phase: children apply the fairness rule to four variables — surface, weight, ramp length, and collision — running controlled tests and arguing from their own evidence.

Changing One Thing at a Time

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