Grouping: Individual
Take-home: Measured lever launcher
Key ideas: Levers, fulcrum position, stored elastic/bending energy, launch distance, measurement.
Start with: Demonstrate the see-saw/cantilever launcher with a clearly marked fulcrum.
Success check: Student launches a soft object in a controlled lane and records distance.
Try changing: Fulcrum position; push-down distance; projectile mass.
Preparation: Prepare fulcrums; glue-gun station; mark a two-finger maximum push rule.
Lesson flow: Day 1: Lever demo → assemble → launch with two-finger rule → record distance → move fulcrum and compare
Safety and cleanup: Soft projectiles only; launch down marked lanes; two-finger push limit; safety glasses if needed.
