While the common meaning of the word " lift" assumes that lift opposes weight, lift can be in any direction with respect to gravity, since it is defined with respect to the direction of flow rather than to the direction of gravity. Lift is also used by flying and gliding animals, especially by birds, bats, and insects, and even in the plant world by the seeds of certain trees. Lift is mostly associated with the wings of fixed-wing aircraft, although it is more widely generated by many other streamlined bodies such as propellers, kites, helicopter rotors, racing car wings, maritime sails, wind turbines, and by sailboat keels, ship's rudders, and hydrofoils in water. Lift is always accompanied by a drag force, which is the component of the surface force parallel to the flow direction. Lift is the component of this force that is perpendicular to the oncoming flow direction. 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.
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