references : MOTION, FORCES AND ENERGY (MC GRAW HILL) NATIONAL GEOGRAPHY

PRODUCING LIFT

Producing lift

According to the Newton’s third law of motion, for every action force there is an equal but opposite reaction force. The wing exerts a downward action force on the air. So the air must exert an upward reaction force on the wing. This reaction force is the lift that enables paper airplanes and jet airlines to fly.

AIRPLANE WINGS

Lift can be increased by increasing the size or surface area of the wing. A larger wing is able to deflect more air downward.

A glider flies at low speeds and uses long wings that have a large surface area to provide the lift it needs

A large cargo plane that carries heavy loads needs large wings to provide a great deal or lift

A plane designed to fly at high speeds, such as a jet fighter, can have small wings

 BIRDS’ WINGS

A bird’s wing provides lift in the same way that an airplane wings does.

A pheasant have short, rounded wings that enable them to take off quickly and make sharp turns

A seabird has long, narrow wings, like the wings of a glider, that help them glide long distances

Falcon, which can fly at high speeds, has small, narrow, tapered wings like those on a jet fighter