# Water as unyielding as concrete

Discussion in 'Physics & Math' started by Lilalena, May 13, 2011.

1. ### John99BannedBanned

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The egg wouldn't break in that example though. What it would do is travel through the air at a distance relative to the speed of the car and gradually lose height until it smashes into the ground. So no it isnt the air, nor friction, nor turbulence but the force. The egg will not break if it is not released though as alluded to in the post above but then a human cannot exert that kind of force, i am not saying that a mechanical device wouldnt break an egg without releasing it because i really dont know.

Bear in mind, in the initial example it is mainly the force breaking the egg because the shell cannot handle the force acting upon it. I am satisfied with the main component being force but if you want to add in terms like pressure and friction that is fine. Goes without saying less force\speed less friction but once and if the egg survives a certain threshold it is in the clear and will not break. Seems to me an egg has more of a chance in water, being fired at the same force than it does in air. For example, the egg is already submerged while fired it survives the same force applied to it while submerged but if the egg is fired\thrown and has to break the surface of the water then it will break at the surface.

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3. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member

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Wrong. As your own "experiment" showed.

Then you're even more stupid than you appear to be.

Please stop posting.

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5. ### John99BannedBanned

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This answers both you question and petes:

http://www.bigsiteofamazingfacts.com/can-an-egg-drop-600-feet-and-not-break

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7. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member

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No it doesn't.
I would ask you to think, but you've never shown any indication that you can.

8. ### PeteIt's not rocket surgeryRegistered Senior Member

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- Do you agree that if the egg in that experiment breaks before it hits something solid, it must have been broken by the air?
- Have you tried it?

9. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member

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See posts #212 and #216 Pete.
He's already done it, but misinterpreted the results...

I suspect the main "force" in any experiment that involves John99 is ignorance.

10. ### PeteIt's not rocket surgeryRegistered Senior Member

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In post 219 I suggested a differentiating experiment.

11. ### Billy TUse Sugar Cane Alcohol car FuelValued Senior Member

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You mean breaks before it hits the road, I am sure. I did not do that experiment, but have my doubts that the egg will break in the air; however if dropped from 150,000 feet, I reasonably sure it will break in the air. Its peak terminal speed will occur in that thin air (perhaps at ~70K feet?) and when it enters the denser low atmosphere it may even make a weak shock wave - that will surely break it in the air.

12. ### NMSquirrelOCD ADHD THC IMO UR12Valued Senior Member

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dunno if this has been addressed..
but Mythbusters did the OP..

but they messed it up a little..the myth is 'is hitting the water like hitting concrete' they assumed that the heights had to be equal, so they busted the myth when they should have confirmed it, cause hitting the water at certain heights did just as much damage as a fall from shorter height over concrete.

13. ### wellwisherBannedBanned

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5,160
Some material properties are often dependent on the time/speed conditions at which stresses are applied.The most fun to experiment with is silly putty. This silicone based rubber will behave differently depending on shear speeds. If you throw it to the ground, for a very fast rate of shear, the silly putty will bounce very high like this gummy material is hard. If you do it slow, it will flatten like gum. The molecules need time to slide past each other, with the faster conditions, too fast too allow this. This causes the silly putty to disperse the stresses differently, so it bounces. If we go slow, the molecules can slide and it shears into a pancake.

Another experiment is making a rope of silly putty and pulling the rope to make it longer. If you do it slow it will stretch like gum. If you do it fast, it will shear cleanly in one spot with no length gain. Again it has to with the fast rate or speed of shear not allowing the molecules to slide concentrating all the stress on a shear plane.
Some material properties are often dependent on the time/speed conditions at which stresses are applied.The most fun to experiment with is silly putty. This silicone based rubber will behave differently depending on shear speeds. If you throw it to the ground, for a very fast rate of shear, the silly putty will bounce very high like this gummy material is hard. If you do it slow, it will flatten like gum. The molecules need time to slide past each other, with the faster conditions, too fast too allow this. This causes the silly putty to disperse the stresses differently, so it bounces. If we go slow, the molecules can slide and it shears into a pancake.

Another experiment is making a rope of silly putty and pulling the rope to make it longer. If you do it slow it will stretch like gum. If you do it fast, it will shear cleanly in one spot with no length gain. Again it has to with the fast rate or speed of shear not allowing the molecules to slide concentrating all the stress on a shear plane.

Water has similar properties under certain conditions. If you have access to a 5000psi pressure washer you can cut through concrete like butter with water. The water can slide at that pressure/speed focusing the energy like it is solid.
Water has similar properties under certain conditions. If you have access to a 5000psi pressure washer you can cut through concrete like butter with water. The water can not slide easily at that pressure/speed focusing the energy like it is solid.

14. ### wellwisherBannedBanned

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5,160
My iPad won't allow me to expand the typing window so I sort of doubled up on the post, trying a work around, since I can't edit anything beyond the space allowed. Sorry.

15. ### NMSquirrelOCD ADHD THC IMO UR12Valued Senior Member

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5,478
lol..you know your addicted when..