Final answer:
Dynamic fluid forces consist of drag and lift. Drag opposes object motion through a fluid, while lift acts perpendicular to the flow. Vector addition methods such as a free-body diagram help illustrate these forces and determine the net external force.
Step-by-step explanation:
Components of Dynamic Fluid Forces
Dynamic fluid forces can be resolved into two main components: drag and lift. Drag is the force that opposes the motion of an object through a fluid, primarily along the direction of the flow. Lift is the force that acts perpendicular to the flow of fluid. These forces can have significant effects on objects moving through fluids, such as air or water, and are essential for understanding the principles of flight, the performance of vehicles, and the behavior of objects in any fluid environment.
Forces, being vector quantities, have both magnitude and direction. They can be added just like other vectors, using the head-to-tail method or trigonometric methods developed in Two-Dimensional Kinematics. A free-body diagram is useful for illustrating these forces and understanding the net external force acting on a body in motion.