Underwater or aerial vehicles with dimples like golf balls could be more efficient and maneuverable, a new prototype has ...

A body moving through a fluid experiences a drag force, which is usually divided into two components: frictional drag, and pressure drag. Frictional drag comes from friction between the fluid and the ...

Captions // Photos on Flickr // Video on YoutubeUnderwater or aerial vehicles with dimples like golf balls could be more efficient and ...

As the bicycle and its rider move along the road, the air exerts a force that increases sharply with speed. The force is due to friction between the air and the exposed surfaces of the rider and ...