Two strange questions

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Dec 27, 2007 | 07:45 PM

#31

Nitramjr

Postmaster

Joined: Aug 2004

Posts: 4,004

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From: North of Boston MA

Quote:

Originally Posted by firstrider

does air have mass ?

Sure does. Not much but it does.

Quote:

I can't wrap my brain around this part. Due to different size tires on different vehicles, this cannot possibly be a constant .

This question (the speed of tire question) is one of those that you "see" and understand or you don't. Once you see it, you are amazed at how simple it is.

Kinda like the airplane treadmill question....

Dec 27, 2007 | 07:52 PM

#32

SteveBricks

FTE Leadership Emeritus

Joined: Aug 2007

Posts: 42,085

Likes: 6

From: Lakewood, Ca.

I see it now. 12' forward motion of vehicle = 12' of rubber on the ground

Light has mass also. (witness my making a feeble attempt at redemption)

Dec 27, 2007 | 08:00 PM

#33

Bdox

Fleet Owner

Joined: Sep 2005

Posts: 28,609

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From: Lake Tahoe, Nevada

Folding... fighting cancer, please join

Quote:

Originally Posted by crehberg

I think you guys have WAAAAAAAAAY too much time on your hands.

Ok, now I'll add a question.....I keep seeing in peoples' sigs a box about overclocking to fight cancer. Anybody got a link where maybe I can get in on the fun????

Here is the link https://www.ford-trucks.com/forums/5...-part-2-a.html

And please do join up. It's a deal that uses our computers idle computing power to aid with cancer research. It's huge! Very important and the more help we can get the better.

I only have one computer running now, but some of the people who are very computer savvy are doing amazing stuff.

Lot's of groups are doing it, some are large and some are just computer clubs, a variety. FTE is sort of odd ball compared to some of the Universities and so forth, but we have reached the top one percent in terms of what we have contributed. So there is kind of a cool competitive thing going on too... Ford truck guys kicking academic butt. It's cool.

Dec 27, 2007 | 09:10 PM

#34

jimdandy

Posting Guru

Joined: Feb 2006

Posts: 1,448

Likes: 1

Quote:

Originally Posted by Aztrainer

Mother's Day - For those that do not live with mommy

Grandparents Day

Parent Teacher Confrence Day

Thanksgiving

Tax Day

I think there could be more.....

I think King Triton had something else in mind, and it has to do with a certain minority. jd

Dec 27, 2007 | 11:58 PM

#35

khadma

Thread Starter

Carpenter Local 745

Joined: Apr 2006

Posts: 5,794

Likes: 11

From: on da beach

Quote:

Originally Posted by firstrider

Where is lostmybeer when you need him ? I think that is what happened to khadma . Have 2 questions for khadma to ponder .Do you think the earth is getting heavier or lighter and does air have mass ?

Yes air has mass.
The earth is getting more crowded everyday. At least on this island. So I would say heavier, but I maybe wrong. It could get lighter because everything loses mass over time-I think. (except I seem to get heavier everday).

So, hub and tire same RPM, 0 speed at bottom, but 2xs as much on top, center of axle is the velocity of bike, and the air moves around with the tire, but at a slower speed.
Am I missing anything else?

Dec 28, 2007 | 01:32 PM

#36

00BlueOvalRanger

Logistics Pro

Joined: Nov 2004

Posts: 4,562

Likes: 2

From: Southern MD

Quote:

Originally Posted by Jimmy Dean

He is correct, the very top of the tire will betraveling at twice the vehicles velocity, the contact patch at 0 mph, and the axle at velocity...this is supposing you are under traction as well

To help wrap your head around that.

There are 2 basic types of velocity.. teh velocity you normally think of, linear velocity, and then there is angular velocity.

Now, the angular velocity of the tire, any point on it, the rim, the hub, is the same. The linerar velocity of the assembly is of course, the same, however that is an average velocity of all the parts.

Since the assembly is also rotating, the combined velocity, both angular and linear, at any given point in time, will not be similiar between two points of differant radii from the center, or even a differant angle from a given starting position of 0 degrees.

Now, to help in English.

a 30 inch street tire, like on my '02, and a 44 inch mudder, like what will be on my future bronco..

in order to go 1320 inches...um 110 feet?...the 30 incher has to rotate 44 times, while the 44 inch tire only has to rotate 30 times. now, if the two trucks are traveling at the same speed, obviously the 44 inch tire is rotating much slower.

Therefore, the 44 incher has a much lower angular velocity. however, it is maintaining the same linear velocity....btw....tanks and their treads are MUCH better example of this....and I dont know really whre to explain from here, except that a wheel powered vehicle moves fowards by placing more rubber/tread in front of the last rubber tread it laid down....much like how you put one foot in front of the other to move foward, except taht this is continuos.
now disregarding tire width, since we will pretend like that doesnt matter right now, no matter the size of the tire, in order to move foward 12 inches, it has to put down 12 inches of rubber, you with my crude explanation? well, if it needs to put down that 12 inches in a second, than at any location along the surface of the tire, the tire will be moving foward 12 inches of rubber in that second, now, if the tire is already moving foward at 12 inches / second, then if you look at the top of tire, it still needs to pass 12 inches of rubber / second to keep up the speed, add in its actual velocity and BAM! 24 inches / second instantaneous velocity.

Say. . . what?

Jim. . . have you been drinking, again? Because I can tell. Your speech is slurred, and I didn't understand a dad-burned thing you said.

Last edited by 00BlueOvalRanger; Dec 28, 2007 at 01:34 PM.

Dec 28, 2007 | 02:30 PM

#37

Bdox

Fleet Owner

Joined: Sep 2005

Posts: 28,609

Likes: 18

From: Lake Tahoe, Nevada

Yeah, but the front of the tire is moving downward, the bottom is moving rearward, the back is moving upward and the top is moving backward. So if you average all that out you end up with ZERO! So if your truck is going, say, 100mph and your tires are going zero, that equals lousy tire wear!