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Author Topic: Question about quantum physics  (Read 700 times)
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dbt1949
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« on: November 17, 2009, 09:26:28 PM »

How do shoelaces move around in your shoe so that sooner or later one side is a lot longer than the other?
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Dan_Theman
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« Reply #1 on: November 17, 2009, 09:37:29 PM »

Quote from: dbt1949 on November 17, 2009, 09:26:28 PM

How do shoelaces move around in your shoe so that sooner or later one side is a lot longer than the other?
I believe that has to do with the Heisenberg certainty principle, wherein it states that the position and momentum of shoelaces will, over a long enough observation, inerringly place themselves in the most annoying configuration.
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kadnod
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« Reply #2 on: November 17, 2009, 09:48:07 PM »

Quote from: dbt1949 on November 17, 2009, 09:26:28 PM

How do shoelaces move around in your shoe so that sooner or later one side is a lot longer than the other?

I think this is covered under String Theory.
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« Reply #3 on: November 17, 2009, 09:51:52 PM »

Quote from: kadnod on November 17, 2009, 09:48:07 PM

Quote from: dbt1949 on November 17, 2009, 09:26:28 PM

How do shoelaces move around in your shoe so that sooner or later one side is a lot longer than the other?

I think this is covered under String Theory.

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TiLT
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« Reply #4 on: November 17, 2009, 10:05:58 PM »

Quote from: dbt1949 on November 17, 2009, 09:26:28 PM

How do shoelaces move around in your shoe so that sooner or later one side is a lot longer than the other?

I've never seen this phenomenon. In fact, it's the first time I hear of it. From the moment I purchase my shoes until I retire them (1-3 years later), the shoelaces remain perfectly adjusted.
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coopasonic
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« Reply #5 on: November 17, 2009, 10:56:41 PM »

Stop pulling so hard. You have heard that before.
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dbt1949
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« Reply #6 on: November 17, 2009, 10:57:18 PM »

Quote from: TiLT on November 17, 2009, 10:05:58 PM

Quote from: dbt1949 on November 17, 2009, 09:26:28 PM

How do shoelaces move around in your shoe so that sooner or later one side is a lot longer than the other?

I've never seen this phenomenon. In fact, it's the first time I hear of it. From the moment I purchase my shoes until I retire them (1-3 years later), the shoelaces remain perfectly adjusted.






That's because they stay frozen all year long where you live.


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disarm
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« Reply #7 on: November 17, 2009, 11:01:50 PM »

Quote from: coopasonic on November 17, 2009, 10:56:41 PM

Stop pulling so hard. You have heard that before.

exactly...tugging too hard to one side all the time is what makes you crooked...
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CeeKay
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« Reply #8 on: November 18, 2009, 12:40:43 AM »

Quote from: disarm on November 17, 2009, 11:01:50 PM

Quote from: coopasonic on November 17, 2009, 10:56:41 PM

Stop pulling so hard. You have heard that before.

exactly...tugging too hard to one side all the time is what makes you crooked...


any more than 3 tugs and you're playing with yourself.
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DamageInc
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« Reply #9 on: November 19, 2009, 06:43:10 PM »

Well two things are at work here, friction and motion.

The amount of motion is exceeding the coefficient of friction holding the laces together.

This http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm or any basic Phyisics book may help

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JayDee
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« Reply #10 on: November 19, 2009, 07:08:00 PM »

I believe the answer is 2.
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CeeKay
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« Reply #11 on: November 19, 2009, 07:38:22 PM »

Quote from: JayDee on November 19, 2009, 07:08:00 PM

I believe the answer is 2.

2ToneTeggy?
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wonderpug
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hmm...


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« Reply #12 on: November 19, 2009, 07:44:35 PM »

This is likely the result of you facing the same easterly or westerly direction more time out of the day than you face any other direction. Due to the curvature of the earth, objects closer to the equator move faster than objects closer to the poles. By facing east or west, one side of your shoe inevitably moves faster than the other. Since an object's mass increases the faster it moves, one end of your shoelace is heavier than the other and after some time it pulls the lace uneven.
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JayDee
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« Reply #13 on: November 19, 2009, 07:46:53 PM »

Quote from: CeeKay on November 19, 2009, 07:38:22 PM

Quote from: JayDee on November 19, 2009, 07:08:00 PM

I believe the answer is 2.

2ToneTeggy?

Either that or QuantumTeggy
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Toe
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« Reply #14 on: November 20, 2009, 02:56:18 PM »

Quote from: wonderpug on November 19, 2009, 07:44:35 PM

This is likely the result of you facing the same easterly or westerly direction more time out of the day than you face any other direction. Due to the curvature of the earth, objects closer to the equator move faster than objects closer to the poles. By facing east or west, one side of your shoe inevitably moves faster than the other. Since an object's mass increases the faster it moves, one end of your shoelace is heavier than the other and after some time it pulls the lace uneven.

This is also why in the southern hemisphere the opposite end of the shoelace would be the longer one.
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