Lenz's Law — Magnetic Braking Lesson
Lenz's Law — Magnetic Braking Lesson https://www.youtube.com/watch?v=QwUq8xM_8bY&t=43s Days: 1 Mode: Teacher demo + student prediction Take-home: No take-home; optional observation card
Teaching & key ideas
Key concepts: Electromagnetic induction, eddy currents, opposing magnetic fields, energy conservation.
Hook: Drop a magnet through copper tubing and compare it with a nonmagnetic object.
Test / evidence: Students predict and compare fall times/materials and explain why the magnet slows.
Variables to change: Tube material; magnet strength; tube thickness.
Lesson flow
Lesson plan:
Day 1: Prediction → dramatic drop comparison → explain Lenz's Law qualitatively → repeat with material/geometry variation
Video:
Lenz's Law
Safety / cleanup:
Teacher handles strong magnets; keep away from electronics/medical devices; no small magnets for student handling.