Part 1 of 5 · freeIntroduction
A big airliner can weigh hundreds of tons. How can anything that heavy stay up in the air? The answer lies in the shape of the wings and the speed of the plane.
Four main forces are at work: thrust (forward), drag (the braking pull of the air), weight (downward) and lift (upward).
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2The wing, a clever shape
- 3You need speed
- 4Climbing, descending, turning
- 5It is not “lighter than air”
Open-book quiz8 questions whose answers are in the text.
Glossary10 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
