What did you not understand about this statement?Studiot post#48
I am interested in the background behind this since in my experience there were some differences of emphasis and rigour in Physics and Applied maths, but no outright conflicts as you describe.
As the person who made the original comment I wish I was able to provide that evidence but I can't. All I can remember is that one of the examining boards used was the Associated Examining Board - but can't remember if the same board was used for both Physics and Maths. I can remember the conflict was discovered in the maths class rather than the physics class.I'm saying that we'd need some details of this 'special' Applied Maths treatment before we could be confident about its existence. Any other treatment of friction would have to be a bit above School / College level, I think. (I'm only implying the need for evidence.)
I think that the force would nave to be described as 'friction'. If not then you'd have to think of another name and 'friction' is a pretty catch-all term which assumes a flat surface. When would a grooved road surface become 'rails, for instance?. There again, a rubber tyre does not have linear characteristics (hysteresis and adhesion, for a start) so it wouldn't be expected to behave in an ideal way. Also, when cornering, there is slippage (work done) and the forces aren't the same as if the car were actually on rails with no slip at all.Friction is not the only tangentiial force acting in the interaction between the road surface and a rolling pneumatic tyre.
If you want a fir comparison with the theory of sliding friction (blocks) you should lock the wheels and tow the truck.
That's how I see a lot of people as.. but you gotta remember there are people out there who really want to learn!The Octet Rule! I would have had a much better time in school and intro chem if I understood that it was mainly to C N O and F. I'm sure my teachers mentioned it at some point, but I never listened in highschool. Sometimes I feel like I wasn't old enough to appreciate what was being taught in highschool!
I think that one was more often seen a century or more ago when the average glass was a lot less perfect and had stresses in it.same for singers breaking wine glasses (at least it doesn't work for non defective glasses)
Oh yes glass can do that.I think that one was more often seen a century or more ago when the average glass was a lot less perfect and had stresses in it.
I only saw it once, sitting at a restaurant table this thick glass suddenly exploded and all that was left was a fine glass powder (except for the stalk I think).
Can you please elaborate?The Octet Rule! I would have had a much better time in school and intro chem if I understood that it was mainly to C N O and F. I'm sure my teachers mentioned it at some point, but I never listened in highschool. Sometimes I feel like I wasn't old enough to appreciate what was being taught in highschool!
I have read the equivalent level of nonsense on some posts on PF in the past. When challenged, the posters have managed to get very stroppy, too!.In elementary school (when I was 8) I was taught that the surface tension of water was due to gravity: Our teacher put the end of a pencil into water and removed it very slowly until it was over the surface but the water was still sticky on it. She said that it's the same force that the Moon exerts on Earth and create tides. The worst thing is that I believed her.
I don't think someone had a similar experience but if you do, please post. :)