According to BernoulliРІР‚в„ўs principle, faster-moving air exerts less pressure, and this causes that there can be a pressure difference between surfaces of the object. This type of drag force is an interesting consequence the BernoulliРІР‚в„ўs effect. Form drag, also known as pressure drag, arises because of the shape and size of the object. This type of drag force depends especially on the geometry, the roughness of the solid surface, and the type of fluid flow. Therefore, a moving fluid exerts tangential shear forces on the surface because of the no-slip condition caused by viscous effects. The boundary layer is the region in which flow adjusts from zero velocity at the wall to a maximum in the mainstream of the flow. In general, when a fluid flows over a stationary surface, e.g., the flat plate, the bed of a river, or the pipe wall, the fluid touching the surface is brought to rest by the shear stress at the wall. Drag is generally caused by two phenomena: Drag force is proportional to the velocity for a laminar flow and the squared velocity for a turbulent flow. Unlike other resistive forces, such as dry friction, nearly independent of velocity, drag forces depend on velocity. The force a flowing fluid exerts on a body in the flow direction. In fluid dynamics, drag is a force acting opposite to the relative motion of any moving object. For hollow objects, the reference area may be significantly larger than the cross-sectional area, but for non-hollow objects, it is the same as a cross-sectional area. The reference area, A, is defined as the area of the orthographic projection of the object on a plane perpendicular to the direction of motion. The drag equation is a formula used to calculate the drag force experienced by an object due to movement through a fluid. One way to express this is by using the drag equation. The drag force, F D, depends on the density of the fluid, the upstream velocity, and the size, shape, and orientation of the body, among other things.

What is h force