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Physics Overview: Mechanics

Fluid Mechanics

Prize-Winning Videos Capture the Strange Beauty of Fluids in Motion

This set of videos shows the impact of water drops on the surface of granular particles—a phenomenon that is likely familiar to all of us who have watched raindrops splashing in a backyard or on a beach. The high-speed photography reveals the detailed liquid-drop impact dynamics at various impact velocities.

A winner of the Gallery of Fluid Motion, this high-speed video shows the impact of a water drop landing on sand. Full video. Xiang Cheng, et al

Describing Movement

Videos to Watch

Archimedes' principle indicates that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces.

The real story behind Archimedes’ Eureka! 

When you think of Archimedes’ Eureka moment, you probably imagine a man in a bathtub, right? As it turns out, there's much more to the story. Armand D'Angour tells the story of Archimedes' biggest assignment -- an enormous floating palace commissioned by a king -- that helped him find Eureka.