Why do objects fall at the same speed?
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Answer: Gravity accelerates all equally
Air resistance equalizes them — Wrong. Air resistance actually makes lighter objects fall slower (feathers vs. Rocks). Without air, all objects fall at same rate—Galileo's discovery!
Gravity accelerates all equally ✓ — Correct! Gravity accelerates all objects equally regardless of mass—9.8 m/s² on Earth. Heavier objects experience more force (F=mg) BUT also have proportionally more inertia (resistance to acceleration). F=ma, so a=F/m=g (mass cancels!). Apollo 15 astronaut dropped hammer and feather on Moon (no air)—fell together! Galileo proved this centuries ago from Leaning Tower of Pisa (probably apocryphal story, but concept correct)!
Weight doesn't affect motion — Wrong. Weight (gravitational force) does affect motion, but it's perfectly balanced by mass (inertia), resulting in constant acceleration for all objects.