Drag is a force that acts opposite to the direction of movement of an airplane. Drag is mainly caused by air. The other forces that act on the plane while moving in the air are thrust, lift etc..
winglet
Drag slows the forward movement of aircraft.
The drag of an airplane is the air resistance caused by the plane flying through air. Similar to when you pull your hand through water and feel resistance.
Flaps would increase drag increasing your speed will increase it even more
Drag effects paper airplane just as it affects anything else that moves. It is either parasitic or induced on paper airplanes. Drag may reduce a paper airplanes speed and/or range.
drag
the force created by air resistance
Drag
Aircraft design reduces drag, but cannot prevent it. Aerodynamics is the study of such.
drag
Lift, Gravity, thrust and drag
Lift, weight, thrust and drag.