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 ...

When you put your hand out the window of a moving car, you feel a force pushing against you called drag. This force opposes a moving vehicle, and it's part of the reason why your car naturally slows ...

Recently, I was driving down the road and stuck my hand out the window. Initially, I was surprised at how much strength I needed to resist the force of the wind. When I turned my hand to the side and ...

Piling up: this image shows water flowing from left to right past a partially submerged sphere. A pile up of water is clearly seen to the immediate left of the sphere. (Courtesy: Harris Lab) ...

Thrips don't rely on lift in order to fly. Instead, the tiny insects rely on a drag-based flight mechanism, staying afloat in airflow velocities with a large ratio of force to wing size. Researchers ...

Uplifting structures: the denticles are inspired by the shortfin mako shark. (Courtesy: James Weaver/Harvard University) A shark skin-inspired design can dramatically improve the lift of an aerofoil, ...