n fluid dynamics, drag refers to forces that oppose the relative
motion of an object through a fluid. Drag forces act in a direction
opposite to the oncoming flow velocity. Unlike other resistive
forces such as dry friction, which is nearly independent of
velocity, drag forces depend on velocity. For a solid object moving
through a fluid, the drag is the component of the net aerodynamic
or hydrodynamic force acting opposite to the direction of the
movement. The component perpendicular to this direction is
considered lift. Therefore drag opposes the motion of the object,
and in a powered vehicle it is overcome by thrust. In
astrodynamics, depending on the situation, atmospheric drag can be
regarded as an inefficiency requiring expense of additional energy
during launch of the space object or as a bonus simplifying return
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