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Author Topic: Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?  (Read 4363 times)

Offline neilep

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Dear Science Peeps Of Superalitve Distinction,

As a sheepy, I of course luff to roll up paper. I get up every day with a hop and a skip in the knowledge that shortly I'll be rolling some paper up !..yes....ewe can quite easily say that my life is fulfilled !

Look...here I am holding a rolled up sheet of A4



Nice eh ?....This makes my day ! :D I'm so happy when I roll up paper !! *le joy*


When I reluctantly put the paper down though............. it is still rolled up !!..amazing !!

look !!



Wow !!...The paper is still rolled up !!

Why is the paper still rolled up ?..what stops it from being unrolled ?..will it eventually unroll itself ?


Please help me answer this....In the mean time I am going to roll up more paper ..YAYYYYYYYYYYYYYYY !!!


hugs & Shmishes



mwah mwah mwah



Neil
I luff To Roll Up Paper
xxxxxxxxxxxxxxxxxxxxxx










 

Offline LeeE

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #1 on: 28/06/2009 16:52:43 »
Because the paper fibers are quite flexible, but not very stretchy, they're not easy to compress; when you try to do so they're more likely to bend and then re-straighten.  However, when you roll the piece of paper up the fibers on the outside of the paper, because they don't stretch very much, get pulled slightly apart.  When you then release the piece of paper, the fibers that were pulled apart don't suddenly jump back to their original position; that would take even more energy, so they stay in their new position, which means that the outside surface of the sheet of paper is slightly greater than the inner surface, so it stays curled.

...I think.
 

Offline neilep

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #2 on: 28/06/2009 22:06:54 »
Because the paper fibers are quite flexible, but not very stretchy, they're not easy to compress; when you try to do so they're more likely to bend and then re-straighten.  However, when you roll the piece of paper up the fibers on the outside of the paper, because they don't stretch very much, get pulled slightly apart.  When you then release the piece of paper, the fibers that were pulled apart don't suddenly jump back to their original position; that would take even more energy, so they stay in their new position, which means that the outside surface of the sheet of paper is slightly greater than the inner surface, so it stays curled.

...I think.

well, I'm convinced !

thank ewe very much LeeE.....My blue piece of paper is still rolled up and seems it's going to stay that way !

Your explanation is fantastic and very much appreciated. Gosh..I know some new stuff today because of ewe..YAYYYYYYY !!

 

Offline stereologist

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #3 on: 29/06/2009 04:45:32 »
It's the same reason that there has never been an assassinated Australian politician: it's basically civility.
cheers
 

Offline neilep

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #4 on: 29/06/2009 08:31:45 »
It's the same reason that there has never been an assassinated Australian politician: it's basically civility.
cheers

Erhmm....Thank ewe for this Stereologist........ but I'm at a loss as to what this has to do with rolled up paper !  ???  grateful though that I am for your kind response !
 

Offline Chemistry4me

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #5 on: 29/06/2009 11:10:24 »
When you get a thin piece of paper, roll that up, un-roll it, it doesn't have that same 'Rolled-up-ness' as a thicker one.
 

Offline LeeE

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #6 on: 29/06/2009 15:36:48 »
When you get a thin piece of paper, roll that up, un-roll it, it doesn't have that same 'Rolled-up-ness' as a thicker one.

That would be so.  Being thinner would mean that there's less difference between the two sides of the sheet of paper.
 

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Why Does Rolled Up Paper Retain It's 'Rolled-up-ness' ?
« Reply #6 on: 29/06/2009 15:36:48 »

 

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