![]() ![]() a sailboat using the wind to move forward). a wing in a wind tunnel) or whether both are moving (e.g. an aircraft flying through the air) or whether the object is stationary and the fluid is moving (e.g. It does not matter whether the object is moving through a stationary fluid (e.g. ![]() Lift is defined as the component of the aerodynamic force that is perpendicular to the flow direction, and drag is the component that is parallel to the flow direction.Ī fluid flowing around the surface of a solid object applies a force on it. Planing lift, in which only the lower portion of the body is immersed in a liquid flow, is used by motorboats, surfboards, windsurfers, sailboats, and water-skis. Aerostatic lift or buoyancy, in which an internal fluid is lighter than the surrounding fluid, does not require movement and is used by balloons, blimps, dirigibles, boats, and submarines. In water or any other liquid, it is called a hydrodynamic force.ĭynamic lift is distinguished from other kinds of lift in fluids. If the surrounding fluid is air, the force is called an aerodynamic force. Lift conventionally acts in an upward direction in order to counter the force of gravity, but it is defined to act perpendicular to the flow and therefore can act in any direction. It contrasts with the drag force, which is the component of the force parallel to the flow direction. Lift is the component of this force that is perpendicular to the oncoming flow direction. The 1902 Wright Glider shows its lift by pulling upĪ fluid flowing around an object exerts a force on it. ![]()
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