Physics · Forces and motion
Falling Objects and Gravity
Without air resistance, every object falls with the same acceleration, g. Its value depends on the planet.
- Time
- 0 s
- Speed now (g × t)
- 0 m/s
- Lands after
- 2.02 s at 19.8 m/s
Where?
Try this
- How long does a 20 m fall take on Earth? On the Moon?
- Double the height. Does the time double?
- Compare landing speeds on Earth and Jupiter.
Key ideas
- h = ½gt², so t = √(2h/g).
- v = gt
- g on Earth ≈ 9.8 m/s².