Ready for take-off?
- ↑SpaceHold for more lift: you climb. On an iPad, press and hold the screen.
- let goGravity pulls you down.
- ☁ ✓Fly through the cloud with the correct answer.
- ☁ ✗Wrong cloud: drag slows you, and the question comes back.
How many questions?
The arrows show the forces on your plane right now: lift up, gravity down, thrust forward, drag backward.