Why does the back of the wing on a commercial airliner extend out during landing procedures? What effect does it have on the aircraft?

Question

Why does the back of the wing on a commercial airliner extend out during landing procedures? What effect does it have on the aircraft?

In: Engineering

Answer 1

Those are called flaps. Flaps make the wing bigger which makes planes fly better at low speeds. Planes are at low speeds when taking off and landing.

At higher speeds they retract into the wing because they aren’t needed anymore.