🍎 Gravitation

Do heavy things fall faster? Toggle the air and find out the surprising truth!

🔨 Hammer (heavy)

🪶 Feather (light)

🔨

🪶

GROUND

Tip: Drop with air ON, then turn air OFF (vacuum) and drop again!

Your mass:40 kg

Mass (never changes)

40 kg

Weight on Earth (g=9.8)

392 N

Weight on Moon (g=1.6)

64 N

On the Moon you'd weigh ~6× less — but your mass stays the same!

🧠 The Big Idea

In a vacuum (no air), everything falls at the same rate — the feather and hammer land together! (Astronauts proved this on the Moon. 🌙)
On Earth, air resistance slows light, fluffy things — that's the only reason a feather drifts down.
Acceleration due to gravity g ≈ 9.8 m/s². Free fall: v = gt, h = ½gt².
Mass = how much matter (kg, unchanging). Weight = pull of gravity = m × g (newtons, changes with g).