What is the term for the pressure effect generated by forward motion in an inlet duct?

The term for the pressure effect generated by forward motion in an inlet duct is known as ram pressure. This phenomenon occurs when an aircraft accelerates through the air, causing the air to become compressed as it enters the engine's intake. The increased kinetic energy of the air flow results in an increase in pressure, which aids in enhancing the efficiency of the engine's performance.

In contrast, static pressure refers to the pressure exerted by a fluid at rest and does not account for motion. Dynamic pressure is associated with the movement of air and is derived from the velocity of the flow; however, it is not specifically the resulting pressure effect experienced in the duct. Atmospheric pressure is the pressure exerted by the weight of the air above a given point and is a baseline pressure that can vary with altitude but is not caused by forward motion. Thus, ram pressure is the most accurate term reflecting the pressure increase due to the forward motion of the aircraft, making it the correct answer.