I succeeded in touching distance:

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I succeeded in touching distance:
« on: 28/12/2014 15:20:43 »

Re: I succeeded in touching distance:
« Reply #1 on: 28/12/2014 15:21:13 »
Quantified...

I used a disk CD and a motor of 1.5 volts.

I placed a plastic lid for the test on the CD.

With the same force of the fingers, turn the CD towards the two sides.

One side rotates twice and the other side rotates 1 and 1/2.

Are shown to the CD stops turning to one side.

(I will continue measuring).

Very affectionately,
Víctor Elias Espinoza Guedez
27 December 2014

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Offline David Cooper

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Re: I succeeded in touching distance:
« Reply #2 on: 28/12/2014 19:01:35 »
Okay, I've got the cat cooked and in the dish. I've tried turning it lots of different ways. What do I do next? Should I eat it while it's still hot.

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Offline RD

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Re: I succeeded in touching distance:
« Reply #3 on: 28/12/2014 23:20:01 »
[attachment=19366]

The moment of inertia of an object depends on the way you rotate it : rotating it one way can be easier than rotating it another way , even though its weight remains the same ,

e.g. Picking up a broom-handle which is lying on the floor is easier when you hold it in the middle than when you hold it at the end , even though it still weighs the same , ( no black holes required).

see ... http://en.wikipedia.org/wiki/List_of_moments_of_inertia
  [ search for the word "about" and "axis" on that wikipedia page ].
« Last Edit: 28/12/2014 23:31:50 by RD »

Re: I succeeded in touching distance:
« Reply #4 on: 29/12/2014 02:02:39 »
It is how blowing sideways.

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Offline RD

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Re: I succeeded in touching distance:
« Reply #5 on: 29/12/2014 09:10:11 »
Put it another way , twirling a rod like a majorettes baton is easier than waving the same rod like a magic wand ...

[attachment=19368]

http://en.wikipedia.org/wiki/List_of_moments_of_inertia#List_of_3D_inertia_tensors

Re: I succeeded in touching distance:
« Reply #6 on: 29/12/2014 09:30:28 »
Put it another way , twirling a rod like a majorettes baton is easier than waving the same rod like a magic wand ...

[attachment=19368]

http://en.wikipedia.org/wiki/List_of_moments_of_inertia#List_of_3D_inertia_tensors

These are not flat dishes

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Offline RD

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Re: I succeeded in touching distance:
« Reply #7 on: 29/12/2014 16:34:57 »
These are not flat dishes

The same principle applies to a dish, or any shape : rotating it about one axis can be more difficult than rotating it about another because of the different moments-of-inertia ...

[attachment=19370]
http://hyperphysics.phy-astr.gsu.edu/hbase/tdisc.html

Re: I succeeded in touching distance:
« Reply #8 on: 29/12/2014 18:33:10 »
These are not flat dishes

The same principle applies to a dish, or any shape : rotating it about one axis can be more difficult than rotating it about another because of the different moments-of-inertia ...

[attachment=19370]
http://hyperphysics.phy-astr.gsu.edu/hbase/tdisc.html

I say turn the disk how a ventillador.