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Posts Tagged ‘Debate’

Stress and Force

Seeing that I’ve have a throbbing headache for all of Sunday, this journal entry is rather late…Most likely this is all from an overload of stress. It’s very different from the physics sense of stress which I’m sure you all remember as amount of force exerted per unit area. Review time!

For much of this weekend, I’ve also been walking around at a constantish velocity carrying a VERY heavy box filled with tons and tons of pages. It was indeed very strenuous but according to physics, I wasn’t actually doing any work since the force applied and the distance the box moved were perpendicular to each other. That, however, didn’t stop me from getting an extremely sore back. Oh joy.

My Lovely Trophies!

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Straws

Well, it’s been an…interesting weekend.  While trying to be productive, I began researching the LifeStraw® because my partner and I clearly need a new debate case.  Basically, the LifeStraw® is a sort of cheap purification tool that removes microorganisms responsible for causing water bourne illnesses (like diarrhea, the 2nd leading cause of death in Sub-Saharan Africa!) from dirty water when you ‘suck’ it through the straw. 

LifeStraw

And that, folks, is the background info on this week’s blog entry, straws!  So, when you’re drinking with a straw, you’re not actually ‘sucking’ in the water/soda/juice/mysterious liquid.  You’re really removing the air inside the straw, making the air pressure in that space lower than 101.325 kPa.  The water column near the bottom of the straw experiences a pressure imbalance (higher pressure on drink and lower pressure in mouth) that provides an upward force, pushing the liquid up the straw and past a horrifying set of teeth.  Just kidding about the last part. ; )

drinking-straw.jpg

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