What effect does increased speed have on parasite drag?

Increased speed leads to a rise in parasite drag, which is commonly divided into form drag and skin friction drag. As an aircraft accelerates, the airflow around it becomes more turbulent, and the contact area with the air increases. Consequently, the overall resistance to the aircraft's movement through that air raises.

Depending on the shape of the aircraft and surface properties, as speed increases, both the skin friction component and turbulent wake behind the aircraft intensify, enhancing the total parasite drag. This phenomenon illustrates why understanding the relationship between speed and drag is crucial for efficient flight operations and performance optimization.

In contrast, the other options do not accurately describe the relationship between speed and parasite drag; drag does not decrease or remain unaffected with increased speed, nor does increased speed generate lift.