Free Fall Simulator
Parameters #1
Cd = 0.47, A = 0.0031 m²
Equation of Motion
ma = mg - 0.5 * ρ * Cd * A * v²
g = 9.80665 m/s², ρ = 1.225 kg/m³
The units and constants behind this fall
A falling body is described by four quantities. Follow any of them into the converter, or into the constant that fixes the rate — something a physics simulation alone cannot show you.
What you are changing
The constant in the formula
- g₀ = 9.80665 m/s² Standard gravity · a defined value, exact — not a measurement
The same 10-metre drop, moved around the Solar System
| Body | g (m/s²) | Time to fall 10 m | vs Earth |
|---|---|---|---|
| Earth | 9.80665 * | 1.43 s | 1.00× |
| Moon | 1.62 | 3.51 s | 0.17× |
| Mars | 3.721 | 2.32 s | 0.38× |
| Venus | 8.87 | 1.50 s | 0.90× |
| Mercury | 3.7 | 2.32 s | 0.38× |
| Jupiter | 24.79 | 0.90 s | 2.53× |
| Saturn | 10.44 | 1.38 s | 1.06× |
| Sun | 274 | 0.27 s | 27.94× |
Times are calculated live from t = √(2h/g) with h = 10 m (no air resistance). * Earth's value is the defined standard gravity g₀; the others are NASA surface-gravity figures.
Why the feather and the hammer land together
In a vacuum the mass cancels out: the force pulling an object down grows with mass, but so does its resistance to being accelerated. Apollo 15 filmed this on the Moon in 1971 — a hammer and a falcon feather hit the surface at the same moment. Switch air resistance on in the simulator and the feather loses.
See what you would weigh on other worlds →