Kaitlyn's+Four+Forces+of+Fight

=Kaitlyn's Four Foces of Fight=

The Four Forces of Flight
The four forces of flight are wieght, drag, lift and thrust. **Weight** is the downward pull on all objects on the earth. **Drag** is the resistans of air of anything that moves through it. **Lift** is an upward pull. And then **thrust** is any force theat moves a plane forward.

What They Do
What do the four forcs do tot a plane? Well **weight** and **drag** work against the planes ability to fly. That is where **lift** and **thrust** come in. Lift and thrust make it easier for the plane to fly. in order for the plane to fly you must have an even or greater amount of lift than weight. And thrust has to be greater than or equal to drag.

Lift and Thrust
Thrust can be grenerated by propelers jets or rockets. Lift is a little bit more advanced. Most planes have wings that are shape like a birds wing, that is called an airfoil. As the plane moves forward the airfoils curved shape creates air pressure both on top and on the bottom of the wing. The air pressure on top of the air foil move faster than the air pressure on the bottom. But the pressure on top has lower pressure than on the bottom. So the air pressure on the bottom overcomes the air pressure on tthe top and that's what makes the plane have lift. That also makes less drag. Newton's second law about motion explains about thrust. Lift is needed to keep an air plne flying through the air. Without any lift the plane would just rop to the ground. The Bernoulli principle is thought to create lift on a plane.

Drag and Weight
Newton's first law explains drags effect on an air plane. Drag is not good for an air plane because it slows it down.