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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 09-07-2001, 10:57 AM Thread Starter
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For those physics lovers!

Found this on the Bimmer board.

"The moment of inertia for a round object is equal to
I=MR^2 where I=inertia, M=mass(in kg), and R=radius of the
rotating object. As you can see, the polar moment of inertia
(the resistance of the wheel to movement) is equal to the mass
multiplied by the square of the radius. This makes a wheels
size much more important than its weight in terms of measuring
a loss of torque at the wheels! A 17" wheel would have to be
roughly half the weight of a 13" wheel to have the SAME inertia!

On the other hand, you can fit bigger brakes in the 17 incher

Hope that was enlightening!
-Jason "

Cool eh?

Fritz




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post #2 of (permalink) Old 09-07-2001, 11:21 AM
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Re: For those physics lovers!

Did you convert the wheel size to meters to go along with the kilograms? Also, If the tires are the same size on different rims, I don't think it would make that much difference. That person on the bimmer board would hate to calculate the moment of inertia on our tires.

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post #3 of (permalink) Old 09-07-2001, 03:06 PM
 
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Re: For those physics lovers!

your bimmer buddy doesn't take into account the tire that is attached to the wheel. unless he doesn't use tires?... its been a while since i've thought about Dynamics, but "stuff" that "spins" has always amazed me. matt

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post #4 of (permalink) Old 09-07-2001, 03:19 PM
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Re: For those physics lovers!

It's bad enough that I'm back in school this week and have to deal with physics there, but now I have to think about it here too. I can't handle all this pressure!!!!!

Shannon
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post #5 of (permalink) Old 09-07-2001, 05:35 PM
 
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Re: For those physics lovers!

physics is all around you, just like any other science. whether or not you appreciate it is something else...

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post #6 of (permalink) Old 09-07-2001, 05:56 PM
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Re: For those physics lovers!

This is being measured in Newtons, right?
Bryan[img]/wwwthreads_images/icons/crazy.gif[/img]

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post #7 of (permalink) Old 09-07-2001, 07:16 PM Thread Starter
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Re: For those physics lovers!

Yeah, I went back and read some of the other posts. They touched on the difference of inertia of the various parts of a wheel and how they would all have different effects.

As to their not taking into account tires...well, I have to admit that for every inch of tire increase for my Jeep, I desire a little less for the Bimmer! The ultimate off road and the ultimate on road.

As to physics...it was one of the only maths I could truly relate to!



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