Reference Terms
from Wikipedia, the free encyclopedia

Drag (physics)

For a solid object moving through a fluid or gas, drag is the sum of all the aerodynamic or hydrodynamic forces in the direction of the external fluid flow.

It therefore acts to oppose the motion of the object, and in a powered vehicle it is overcome by thrust.

Note:   The above text is excerpted from the Wikipedia article "Drag (physics)", which has been released under the GNU Free Documentation License.
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