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it is a mechanical force. It happens by the interaction of a solid body with fluid
Drag is generated by the change in velocity between the solid and liquid
SO DRAG IS VECTOR AND ACTS IN A DIRECTIONS THAT IS OPPOSITE TO THE MOTION FO THE AIRCRAFT.
DRAGE IS EQUAL TO AERODYNAMIC FRICTION.
An example of drag is Skin friction, between the molecules of the air and of the solid body. So have a smooth body will have the least friction. For the drag, it is the viscosity and they use Reynolds number to help predict flow patterns in different fluid: ex in the atmosphere. Re = RUL/U
u = flow speed
l = linear dimension
u = dynamic viscosity
Boundary layer: Laminar to Turbulent with the flow sticking to object
TO MEASURE THE AMOUNT OF DRAG:
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