Galileo Galilei challenged the ancient belief that heavier objects fall faster. His experiments showed that all objects fall at the same rate when air resistance is removed.
1. Drop in air: Notice how the feather falls slower
2. Create vacuum: See all objects fall together!
3. Reset and repeat: The results are always the same
On the Moon (no atmosphere), a hammer and feather dropped together hit the ground at exactly the same time! This was demonstrated by Apollo 15 astronauts in 1971.
Where: d = distance, g = gravity (9.8 m/s²), t = time
Where: v = velocity, g = gravity (9.8 m/s²), t = time