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Moving through air has a cost
Drag is an aerodynamic force opposing motion relative to the air.
The idea
Shape, speed and flow conditions affect drag. Drag associated with producing lift is one part of the total.
An example
Changing an aircraft's configuration can change drag even when the aircraft stays the same size.
Put it into practice
Ask which source of drag changes in the situation.
Further reading: NASA · Glenn Research Center ↗
Test yourself: Which statement about drag is correct?
Many aircraft surfaces contribute to it
Drag comes from interaction between the aircraft and air.
Explanation and illustrative examples by One Card Wiser. Source linked for further reading.
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