Spin, or the lack thereof, plays a major role in many sports — including tennis, golf, football, baseball, volleyball, and table tennis — because it affects whether flow stays attached Keep reading
Tag: rotation
Spinning Bubbles
Fluid dynamics is largely about figuring out the relationship between forces. For a soap bubble sitting still, that’s primarily the effect of gravity, which makes the fluid in the soap film drain downward, and Keep reading
Self-Digging Seeds
Some plants in the Pelargonium family produce seeds with long helical tails. These appendages, formally known as awns, are humidity-sensitive. On humid nights or after rainfall, the awn begins to straighten. Keep reading