Buffalo
Original Poster
5,030 posts
145 months

kN/m2..? Having mental block Is it multiply by 50..? Ta


chaparral
965 posts
150 months

9.81 N=1 kg mass under gravity on earth's surface. 10000 cm2=1 m2. Therefore, it's around 1050 kg/cm2=1 N/m2.


chrisjl
784 posts
173 months

chaparral said:9.81 N=1 kg mass under gravity on earth's surface. 10000 cm2=1 m2. Therefore, it's around 1050 kg/cm2=1 N/m2. 
Err, hasn't that gone horribly wrong somewhere? 1 tonne per square centimeter does not equal 1 Newton per square meter


AndyS2
795 posts
149 months


chrisjl
784 posts
173 months

1kg/cm2 = 10,000kg/m2 = 1,020N/m2 = 1.02kN/m2 (maybe, it's been a long hard day...)

Advertisement


joust
14,612 posts
150 months

You can do it in google "1 kilogram per centimeter squared / 1 Newton per meter squared" in google gives 10 000 s2 / m i.e. you are of course talking about two different things and therefore have SI units left over.... A Newton is m * kg * s2. J


Buffalo
Original Poster
5,030 posts
145 months

chrisjl said:1kg/cm2 = 10,000kg/m2 = 1,020N/m2 = 1.02kN/m2 (maybe, it's been a long hard day...) 
That was the figure (roughly) that i made it out to be, but then someone came and ballsed my head up with this x50 nonsense... I pout in his general direction! humph


jim'schim
502 posts
143 months


joust
14,612 posts
150 months

chaparral said:9.81 N=1 kg mass under gravity on earth's surface. 10000 cm2=1 m2. Therefore, it's around 1050 kg/cm2=1 N/m2. 
Err  not the SI unit of a Newton isn't! The 9.8 would only be if you were talking about a mass that was accelerating in a true vertical fashion, if you are talking about force perpindicular to gravity then gravity doesn't have anything to do with it.... See above... J >> Edited by joust on Friday 9th January 17:19


Buffalo
Original Poster
5,030 posts
145 months


joust
14,612 posts
150 months

Buffalo said: 1 kgforce/sq.centimetre x 98 066.5 = answer in pascals (N/m2) That'll do i think...!

Well done that man! Of course if you type "1 Newton per meter squared" into google it tells you 1 (Newton per (meter squared)) = 1 Pascal And hence if you then want to convert that back in Earth's reference then the 9.80665 gets into play. Anyone get a feeling this could turn into another "big bang" thread! J >> Edited by joust on Friday 9th January 17:20


Buffalo
Original Poster
5,030 posts
145 months

joust said: It didn't help that i started the day off pissed... Ta chap! Oh i did get the Pa to kPa thing, thankfully i am not that far gone (yet)... Off to the pub  been a long day! Suggest you all do the same! >> Edited by Buffalo on Friday 9th January 17:22


Incorrigible
13,668 posts
152 months

Pedantic git Of course you can't compare mass with force Unless you live somewhere with gravity You know he meant Kilogram force But I like your stlye


chaparral
965 posts
150 months

I didn't see the k in front of the N. Just divide my answer by 1000 to get it in kN/m2. A kilogram is a unit of mass. A Newton is a unit of force. A force of one Newton will accelerate one kilogram at the rate of one meter per second per second. While it is in close proximity to the surface of the earth, gravity will exert a FORCE of 9.81 Newtons, directed straight down, on any and every 1kg object. If there is no other force on the object, this force will cause the object to accelerate at the rate of 9.81 m/s/s. However, if you place the object on a level table, the table will exert a reaction force that is equal in magnitude and opposite in direction to said gravitationally exerted force  the force due to gravity doesn't go away, it's just opposed by an equal reaction force giving a net force of zero.


Bodo
9,535 posts
157 months

chaparral said: [smartarsemode]9.81 m/s [/smartarsemode]


chaparral
965 posts
150 months

Bodo, these are equivalent expressions. m/s^2 is just shorthand for meters per second per second.


minghis
1,352 posts
142 months


joust
14,612 posts
150 months

Incorrigible said:Pedantic git 
Who moi???


roop
5,996 posts
175 months


dbrennan
2 posts
66 months

Thanks, I have this cloud following today, I wish i could just restart the day from the begining.

