Drop objects from a cliff. Predict the fall time, then watch real physics work — on Earth, the Moon, or in a vacuum!
🧠 Galileo's Big Discovery
In a vacuum (no air), ALL objects fall at the same rate — a feather, a stone, a hammer. Galileo proved it ~1590. NASA tested it on the Moon with a feather + hammer in 1971. Both hit the ground together.
distance = ½ × g × t²
On Earth, g = 9.8 m/s². Air slows lighter things (feathers).
On the Moon, g = 1.6 m/s². Things fall ~6× slower. CBSE Class 9 — Gravitation
📘 Free-Fall Lesson
⚡ Acceleration due to gravity
Every object near Earth's surface speeds up at g = 9.8 m/s² while falling. So after 1 sec → 9.8 m/s, after 2 sec → 19.6 m/s, and so on.
📏 Fall distance formulas = ½ g t²
For a 20m fall on Earth:
t = √(2 × 20 / 9.8) ≈ 2.02 seconds
🪶 Air resistance
In our atmosphere, light/large objects (feathers, paper) hit the air more and fall slowly. Heavy small objects (stone) push through and fall close to free-fall speed.
That's why in this game's Vacuum mode, the feather drops as fast as the stone!