1What's really fighting over a falling thing
Falling is a tug-of-war: gravity pulls down, air pushes back
You only need two ideas. Watch each one:
Gravity pulls everything down
Gravity tugs a feather, a brick, and a sheet of paper down with the same pull. On its own, it would make everything speed up toward the ground exactly the same.
Air pushes back on movers
Air is real stuff, and a falling thing has to shove it out of the way. The wider the face it pushes with, the more air pushes back — and the more it gets slowed down.
2Two shapes, same paper
The air-catcher vs the air-dodger
Take that one sheet of paper. You can leave it flat, or crumple it — and the two shapes meet the air in totally opposite ways:
The air-catcher
A big, wide face slams into lots of air, so the air shoves back hard — it floats down slowly.
The air-dodger
A tiny face barely touches the air, so the air hardly pushes back — it drops fast and straight.
3Your turn — crumple it
Scrunch one sheet and watch what changes (and what doesn't)
Drag the slider to scrunch this flat sheet into a tighter and tighter ball. Keep one eye on the two meters below — one of them does not move at all.
4Now race them
Two identical sheets, same weight. Drop both at once 🪂
Here are two sheets from the same pad — the scale says they weigh exactly the same. One is crumpled into a tight ball, the other left flat. Guess first, then drop them together and watch.
Guess before you drop them
Two identical sheets, exactly the same weight — one crumpled into a ball, one left flat. You let go of both at the same moment. Do they land together?