drag

drag

Force 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.

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To 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.

To drag an object with the mouse, point to it. Press the mouse button and hold the button down while moving the mouse. When the object is at its new location, release the mouse button. See Win Drag and drop.

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drag - drag and drop