Speed
Because of the extreme speeds of the Mantis Srimp strike underwater,a cavitation bubble developes. Surprising finding that each strike generates two brief, high-amplitude force peaks, typically 390–480 μs apart. Based on high-speed imaging, force measurements and acoustic analyses, it is evident that the first force peak is caused by the limb's impact and the second force peak is due to the collapse of cavitation bubbles (S. N. Patek, R. L. CaldwellJournal of Experimental Biology).
When cavitation bubbles collapse, considerable energy is released in the form of heat, luminescence and sound (Brennen, 1995). The shock waves and microjets generated during the collapse of the cavitation bubbles cause stress and fatigue in adjacent surfaces, ultimately leading to failure and flaking of surface materials (Brennen, 1995). Remarkably, a 2.7 mmcavitation bubble collapsing near a wall can generate over 9 MPa of impact pressure over a period of approximately 5 μs (Shima et al., 1983; Tomita et al., 1983). Such cavitation forces can destroy rapidly rotating boat propellers, aid in water-based metal cutters, and are even thought to provide the mechanism by which water picks remove dental plaque (Brennen, 1995).
Speed
This is a video on the fastest punch in the world by the Smithsonian. >>