Units of Torque

[soydios]

torque = (mass) x (acceleration) x (distance)
Newton-meter = Newton(kg x m/s2) x meters
ft-lbs = lbs(slugs x ft/s2) x feet

SI units FTW: Newton-meters

 

[LordMorpheus]

Joules is inaccurate - a torque is not an energy.

The equation Work = Force * Distance gives an energy when you have a force acting in line with the displacement. For a torque, the force is acting perpendicular to your distance.

Joules is wrong.

 

[Colt45]

for power, hp or kW make no difference to me, but for some reason I can never remember conversion between ftlbs and nm.
so foot pounds then

 

[FleshLight]

It depends on what system you're using.

T = r X F

r is in any measurement you want, ft., in., m, M, pm, etc
F is in Newtons.

 

[Chaotic42]

I like (N*m*s*gals)/(qt*min)

 

[Demon-Xanth]

Joules is a measurement of energy. Nm is a measure of torque. They differ in the scope of thier measurement. A joule is the work done by exerting 1 newton over 1 meter. However, when you exert 1 newton of force on a 1m wrench and the bolt does not turn, you still have 1 Nm of torque, however you have done no work.

 

[LS20]

Originally posted by: 91TTZ
All the kiddies who want to act "euro" prefer N.m

All the real gearheads will prefer ft*lbs if they're from the US.

Just about all US documentation refers to torque in ft*lbs.

All scientists and engineers and otherwise educated people prefer N*m

All the real ignant rednecks prefer ft*lbs

(atleast they use Liter displacement... thats a start...)

 

[skyking]

Originally posted by: Demon-Xanth
Joules is a measurement of energy. Nm is a measure of torque. They differ in the scope of thier measurement. A joule is the work done by exerting 1 newton over 1 meter. However, when you exert 1 newton of force on a 1m wrench and the bolt does not turn, you still have 1 Nm of torque, however you have done no work.

Nicely put. I use ft/lb because all the old stuff I work on uses ft/lb in the manuals.

 

[WhiteKnight]

Originally posted by: LordMorpheus
Joules is inaccurate - a torque is not an energy.

The equation Work = Force * Distance gives an energy when you have a force acting in line with the displacement. For a torque, the force is acting perpendicular to your distance.

Joules is wrong.

I can't believe that it took so long for someone to point this out.

 

[Born2bwire]

I use N-m myself. Torque does no work so it is misleading to use J.

 

[Vegitto]

1 Nm = 1 J.

 

[BrownTown]

yeah, the Newton Meter != Joule is kinda like Volt Ampere != to Watts.

 

[Paperdoc]

Has to be Nm. Torque is the product of a force (acting tangentially arout a rotational point) times a distance from the centre to the point of application of the force. So units have to be (force) x (distance), like NM or ft-lb or in-lb.
Joules are a unit of energy - not force , not work. You cannot convert a specified quantity of energy into a force or a torque.

 

[fitzov]

I prefer Choco-Leibniz/ft myself.

 

[Howard]

Nm. Go SI!

 

[Vegitto]

Originally posted by: Chaotic42
I like (N*m*s*gals)/(qt*min)

You like (Newtons*meters*angle*volume)/(quarts/minute)?
What will that give you? How fast something with x torque will fill a gallon from x meters under an angle of x degrees?

 

[Raduque]

Originally posted by: LS20

Originally posted by: 91TTZ
All the kiddies who want to act "euro" prefer N.m

All the real gearheads will prefer ft*lbs if they're from the US.

Just about all US documentation refers to torque in ft*lbs.

All scientists and engineers and otherwise educated people prefer N*m

All the real ignant rednecks prefer ft*lbs

(atleast they use Liter displacement... thats a start...)

I give you :thumbsdown:. Real men measure displacement in Cubic Inches, power in Horsepower and Torque in ft-lbs.

 

[Howard]

Originally posted by: Raduque

Originally posted by: LS20

Originally posted by: 91TTZ
All the kiddies who want to act "euro" prefer N.m

All the real gearheads will prefer ft*lbs if they're from the US.

Just about all US documentation refers to torque in ft*lbs.

All scientists and engineers and otherwise educated people prefer N*m

All the real ignant rednecks prefer ft*lbs

(atleast they use Liter displacement... thats a start...)

blah blah blah

Yes, sir!

 

[Mo0o]

I use N*m since they're SI units. I usually dont use Joules, which i reserve for energy

 

[silverpig]

It's not Joules because a torque is a vector quantity, which is a cross product of two vectors (radial distance and force). Energy (Joules) is a scalar quantity coming from a dot product.

 

[pray4mojo]

Originally posted by: Raduque

Originally posted by: LS20

Originally posted by: 91TTZ
All the kiddies who want to act "euro" prefer N.m

All the real gearheads will prefer ft*lbs if they're from the US.

Just about all US documentation refers to torque in ft*lbs.

All scientists and engineers and otherwise educated people prefer N*m

All the real ignant rednecks prefer ft*lbs

(atleast they use Liter displacement... thats a start...)

I give you :thumbsdown:. Real men measure displacement in Cubic Inches, power in Horsepower and Torque in ft-lbs.

oh right and dont forget psi instead of bar.