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drag |
Also found in: Dictionary/thesaurus, Medical, Acronyms, Idioms, Wikipedia, Hutchinson | 0.03 sec. |
dragForce exerted by a fluid stream on any obstacle in its path or felt by an object moving through a fluid. Its magnitude and how it may be reduced are important to designers of moving vehicles, ships, suspension bridges, cooling towers, and other structures. Drag forces are conventionally described by a drag coefficient, defined irrespective of the shape of the body. Dimensional analysis reveals that the drag coefficient depends on the Reynolds number; the precise dependence must be elucidated experimentally and can be used to predict the drag forces experienced by other bodies in other fluids at other velocities. Engineers use this principle of dynamic similarity when they apply results obtained with a model structure to predict the behaviour of other structures. See also friction; streamline. dragTo move an object on screen such that its complete movement is visible from starting location to destination. The movement may be activated with a stylus, mouse or keyboard keys. drag 1. an implement, such as a dragnet, dredge, etc., used for dragging 2. a sporting coach with seats inside and out, usually drawn by four horses 3. a braking or retarding device, such as a metal piece fitted to the underside of the wheel of a horse-drawn vehicle 4. Aeronautics the resistance to the motion of a body passing through a fluid, esp through air: applied to an aircraft in flight, it is the component of the resultant aerodynamic force measured parallel to the direction of air flow 5. the trail of scent left by a fox or other animal hunted with hounds 6. an artificial trail of a strong-smelling substance, sometimes including aniseed, drawn over the ground for hounds to follow 7. Angling unnatural movement imparted to a fly, esp a dry fly, by tension on the angler's line 8. short for drag race
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A WOLF, meeting a big well-fed Mastiff with a wooden collar about his neck asked him who it was that fed him so well and yet compelled him to drag that heavy log about wherever he went. A KIND-HEARTED Physician sitting at the bedside of a patient afflicted with an incurable and painful disease, heard a noise behind him, and turning saw a cat laughing at the feeble efforts of a wounded mouse to drag itself out of the room. They dig, they hoe, they reap, they sow, they bear monstrous burdens on their backs, they shove similar ones long distances on wheelbarrows, they drag the cart when there is no dog or lean cow to drag it--and when there is, they assist the dog or cow. |
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