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Torque Explained

In the simplest sense Torque = Force * Length

Torque is derived and traceable to SI units of length,  mass,  and time.

The meter is the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second.
The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.

The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyper-fine levels of the ground state of the cesium 133 atom.

Torque, also called moment or moment of force is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist.

To convert from one unit of torque to another, requires knowing the appropriate conversions.

Torque = Force x Length
Force Conversion Factors

newton (N) to lbf = MULTIPLY BY  0.2248089431
newton (N) to kgf = MULTIPLY BY  0.1019716212978
newton (N) to ozf = MULTIPLY BY 3.59694309
lbf to newton (N) = MULTIPLY BY 4.4482216152605
lbf to KGF = MULTIPLY BY 0.45359237
lbf to ozf  = MULTIPLY BY 16
kgf to lbf = MULTIPLY BY 2.20462262
kgf to newton (N) = MULTIPLY BY 9.80665
Kgf to ozf = MULTIPLY BY 35.27396
ozf to newton (N) = MULTIPLY BY 0.2780139
ozf to lbf = MULTIPLY BY  0.0625
ozf to kgf = MULTIPLY BY 0.0283495231

Torque = Force x Length
Length Conversion Factors

METER (m) to FEET (ft) = MULTIPLY BY  3.2808399
METER (m) to INCHES (in) = MULTIPLY BY 39.3700787
FEET (ft) to METERS (m) = MULTIPLY BY  0.3048
FEET (ft) to INCHES (in) = MULTIPLY BY 12
INCHES (in) to FEET (ft)= MULTIPLY BY 0.0833333333
INCHES (in) to METERS (m) = MULTIPLY BY 0.0254

Examples

Force  1N = 0.2248089431 lbf         Length 1m = 3.280839895 ft
1 N-m = 0.2248089431 x 3.280839895 = 0.7375621489 ft-lbf

Force  1N = 0.2248089431 lbf         Length 1m = 39.3700787  in
1 N-m = 0.2248089431 x   39.3700787= 8.50745782 in-lbf

written by  Henry Zumbrun

Posted at, March 03, 2016 12:00:00