Drag force refers to the resistance encountered by the object due to the interaction between its surface and the fluid it is moving through.
Where:
- represents the drag force experienced by the object,
- is the density of the fluid (e.g., air or water),
- is the velocity of the object relative to the fluid,
- is the drag coefficient, which is a dimensionless parameter that characterizes the drag characteristics of the object and depends on factors such as shape, surface roughness, and flow conditions,
- represents the reference area of the object perpendicular to the direction of motion.