Drag is defined as?

Drag is defined as?

• A. Upward force
• B. Energy of the system
• C. Force causing gravity
• D. Resistance to forward motion

Answer: (D)

Drag is the resistive force that opposes an object’s motion through a fluid, such as air. It acts opposite to the direction of travel and arises from air molecules colliding with the moving body and being pushed aside. In a drone, this means drag increases with speed and depends on air density, the drone’s frontal area, and its drag coefficient. The greater the forward speed, the larger the drag force, which is why additional thrust is needed to maintain or increase speed. Drag is a force, not energy, and it is not gravity or lift; lift helps you rise, gravity pulls you down, and drag simply slows down forward motion. A common way to express it is Fd = 0.5 * rho * v^2 * Cd * A, showing why streamlined shapes and smaller cross‑sections reduce drag.

Drag is the resistive force that opposes an object’s motion through a fluid, such as air. It acts opposite to the direction of travel and arises from air molecules colliding with the moving body and being pushed aside. In a drone, this means drag increases with speed and depends on air density, the drone’s frontal area, and its drag coefficient. The greater the forward speed, the larger the drag force, which is why additional thrust is needed to maintain or increase speed. Drag is a force, not energy, and it is not gravity or lift; lift helps you rise, gravity pulls you down, and drag simply slows down forward motion. A common way to express it is Fd = 0.5 * rho * v^2 * Cd * A, showing why streamlined shapes and smaller cross‑sections reduce drag.