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<br /> <br />Water pressure in action I <br />Water cannot be squeezed into smaller spaces. <br />So if you press down on water in a container, <br />the water tries to flow out somewhere else. <br /> <br />~ b.d Vpu Know" <br />"" ;--........ fill the water pistol with water here. Water running down a drain will <br />1 - ~ "'" I rotate in a different direction in the <br />This ~~ called .!!Yd~aullc pressure, l... "" " ~~ ~o:~~ .. Northern and Southern Hemispheres. <br />and Its what operates forklift trucks 77""'-. '"'"'7f'j If water runs out from a perfectly <br />and the brakes in most cars. It's also L ,~'c"'J - symmetrical bathtub or toilet bowl in <br />what makes water pistols squirt so farl. ,~. the Northern Hemisphere it swirls <br />JI- ~_/;: '. t: '" counterclockwise, and water spins <br />Trigger creates pressure within the ".... --...:~ <br />,. ~ clockwise in the Southern Hemisphere. <br />reservoir and forces water through tubing. , <br />I This phenomenon is due to the Coriolis <br />~.. \ effect, which is the influence that the <br />\ earth's rotation has on any moving body of <br />~ 1\ water or air. This explains the counterclockwise <br />~ or clockwise rotation of water as it flows down <br />a"t the drain. <br /> <br />A70M. <br />~I rbJ <br />20 ydrogen <br />+ <br />1 Q xygen <br />l\t~t,- <br /> <br /> <br />I <br />\)~ <br /> <br />~ ~[t{J <br /> <br />r............. <br /> <br />...- <br /> <br />. <br /> <br />-- <br /> <br /> <br />If you watched the 1996 Summer Olympia, maybe you saw <br />the swimming competition. Looks simple -. glide along on the <br />water, move your arms and legs and go as fast al you can. <br />Courtney Willis, a University of Northern Colorado physia <br />professor, says there are a couple of reasons why we can swim. <br />Things float when the buoyancy, or the force of the water <br />pUShing up, Is equal to the weight of the object. When our <br /> <br />--- - <br /> <br />NCWCI>-RIJNOFF-1997 <br /> <br /> <br />The <br />swirling <br />tornado in the <br />bottle is called a <br />vortex, which is a type <br />of motion that causes <br />liquids and gases to <br />travel in spirals around <br />a center line. An <br />example is when you <br />pull the plug on the <br />bathtub drain, the <br />water spins in the form of <br />a vortex. A vortex will <br />continue its rotating <br />action naturally until <br />something occurs <br />to stop it. <br /> <br />reprinted by permission <br />'TamIng the Tornado Tube' <br />by Steve Spangler <br /> <br />.." <br /> <br />lungs are filled wltn air, we are lighter than the water our <br />bodies could displace. We fl(l'J: <br /> <br />To swim we have to move forward. When we do the aawl I <br />our ann. push down and backwards. The downward push lifts <br />us up out of the water a little and the backwards motion <br />pushes us forward. <br /> <br />We swim <br /> <br />- - -- - - <br /> <br />-- - <br /> <br />- <br /> <br />R~/3 <br /> <br />.'.. <br /> <br />" <br />'.' <br /> <br />I <br /> <br />