Drag Weight

Drag Weight
can some explain thrust, drag, lift and weight?

can someone elaborate give a few sentences on these words relating to aerodynamics.
Drag:
Thrust:
Lift:
Weight/Gravity:
I’m hoping to use this information to build paper planes
thanks guys

Drag: This is the force that opposes forward motion. It is a combination of parasite and induced drag added together. Parasite drag is the result of skin friction as air moves across the body of the plane. Induced drag is the result of lift. Some lift always acts backward and that tends to slow the plane down.

Thrust: Thrust opposes drag and helps to move the airplane forward. It is produced by the propeller. As air is grabbed by the propeller and thrown backward by it, an equal and opposite reaction occurs whereby the plane os moved forward.

Lift: Lift is the result of airflow over the wings. It is a far too complex subject to “define” lift in a few sentences, but it is produced by the wings and acts approximately upward in opposition to gravity.

Weight: Weight is pretty self explanatory. However absolute weight is not the same as measured weight. When aircraft enter into turns or banks, they gain additional weight called load factor. The load factor it 1 in a straight and level turn and 2 in a 60 degree banked turn (and about 9 in an 80 degree bank). Also, the horizontal stabilizer acts as an inverted wing stabilizing the flight path of the plane by pushing the tail down. This additional weight must also be overcome aerodynamically.

These four forces are said to be in balance when an aircraft is in straight and level, unaccelerated flight. When the aircraft is not speeding up, slowing down, climbing, descending, or turning, thrust equals drag and lift equals weight.

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