Reaction time ruler drop: a 25-minute PE and science lab for 6th grade

1. Partner A holds the ruler at the top, zero end down. Partner B places thumb and pointer finger on either side of the zero mark without touching it.
2. Without warning, Partner A lets go. Partner B catches the ruler as fast as possible. Read the inch mark just above the thumb.
3. Do 5 tries, record each one and switch roles. Use the table to turn the middle value (the median) into seconds.
4. Predict, then test one change: the other hand, eyes closed with a tap on the shoulder as the signal, or right after 30 seconds of jumping jacks.
5. Compare class results: what made reaction time faster or slower?
6. Connect to sport: where do athletes need quick reactions, and how do they train them (practice, focus, reading cues)?

Safety: drop the ruler straight down, never toward a face; the jumping jacks are a short burst with soft landings and a rest afterward; students who feel dizzy sit down and stop. Every session: warm up first, clear the space, keep water nearby, and stop if anything hurts or a student feels dizzy or unwell.

Differentiation: students who need support can catch a yardstick and record distance only. Students who are ready can calculate the time themselves with t = √(2d ÷ g), using d in meters and g = 9.8. English learners can use the frame "My reaction time was __ seconds."

Quick check: ask a student to turn a 6-inch catch into seconds and name one thing that changed their results.

For a full year of free grade 6 PE sessions, see Move Every Day from UpOnly Learning.

For more ideas at this grade, browse the other free activities on the Hub.