Re: RM Matthew's thread
Air pressure in a standing tire is evenly distributed. Effects of differring altitude are neglible beyond negligable.
- njc
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Re: RM Matthew's thread
Because of the physics of a gas. One of its basic properties is that in the absence of acceleration, movement within it, etc., it distributes evenly within the enclosing volume and has everywhere the same pressure. (Note that I stated that the differences in altitude between top and bottom of the tire are negligible beyond negligible.)
I will add at this point that the tire's construction involves a flexible but almost inelastic layer of fabric 'plies' embedded in a tough and elastic rubber, as well as a strong wire loop called the 'bead' that reinforces the tire's openings where those openings rest in the wheel.
54 2015-12-25 17:46:26 (edited by njc 2015-12-25 17:47:18)
- njc
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Re: RM Matthew's thread
Note also that the material of a tire is essentially a tension material. The tread of the tire is in compression, but as a compression member it is far too short to buckle, being wider than its length (thickness) in compression. But if you put the wall of a tire in compression along the surface of the notional membrane, the wall will buckle. And if it didn't, the tire wouldn't work the way it does.
Finally, remember that in stasis all the forces must balance, at every point.
- amy s
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Re: RM Matthew's thread
Interesting thoughts that made my head hurt. This must mean I learned something.
Happy holidays to all, in the fashion to which you've become accustomed and with the people who matter.
A
- njc
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Re: RM Matthew's thread
amy s wrote:
Interesting thoughts that made my head hurt. This must mean I learned something.
No. It means you're on the verge of learning.
Think about the tire when the car is on a lift and there's no contact with the ground. Account for all the forces. Then let the car down to the ground at watch what happens.
Note to the people who clutch their heads and say "I can't do this!"--that's how you feel at the brink of the breakthrough.
- janet reid
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Re: RM Matthew's thread
RM, I've reviewed Robbie's first two chapters ... take a deep breath before you read them. My intent is to help and support, so I hope that is clear despite the feedback that I think can be taken as pretty harsh. As I said, by all means, you can take my suggestions and throw them out! Hope some of it helps though! Janet
