Magic Rollback Can
Magic Rollback Can https://www.youtube.com/watch?v=bQyK47SBkHw Days: 1 Mode: Individual or pairs Take-home: Working rollback can
Teaching & key ideas
Key concepts: Stored elastic energy, rotational motion, internal mechanisms, energy transfer.
Hook: Roll a completed can away and let it mysteriously return.
Test / evidence: Can rolls away, slows, reverses, and returns at least partway.
Variables to change: Rubber-band tension; internal mass; can diameter; starting push.
Lesson flow
Lesson plan:
Day 1: Reveal mechanism → assemble → roll trials → adjust internal mass/tension
Video:
Magic Rollback Can - Sick Science! #051
Safety / cleanup:
Teacher prepares holes/cutting; internal weights must be secured; use floor lanes.