Newton metre
A newton metre is a unit of torque (also called "moment") in the SI system. The symbolic form is N m or N·m,[1] and sometimes hyphenated newton-metre. One newton metre is equal to the torque resulting from a force of one newton applied perpendicularly to a moment arm which is one metre long.
It is also used less commonly as a unit of work, or energy, in which case it is equivalent to the more common and standard SI unit of energy, the joule.[2] In this very different usage the metre term represents the distance traveled or displacement in the direction of the force, and not the perpendicular distance from a fulcrum as it does when used to express torque. This usage is discouraged by the SI authority, since it can lead to confusion as to whether a given quantity expressed in newton metres is a torque or a quantity of energy.[3]
[edit] Conversion factors
- 1 newton meter = 0.7375621 pound-foot (often "foot-pound")
- 1 kilogram-force meter = 9.80665 N·m[4][5]
- 1 pound-foot (often "foot-pound") = 1 pound force foot ≈ 1.3558 N·m
- 1 inch ounce-force = 7.0615518 mN·m
- 1 dyne centimetre = 10−7 N·m
[edit] See also
[edit] References
- ^ BIPM - unit symbols
- ^ For example: Eshbach's handbook of engineering fundamentals - 10.4 Engineering Thermodynamics and Heat Transfer "In SI units the basic unit of energy is Newton-Meter".
- ^ BIPM - special names
- ^ Mechanical Engineering Formulas Pocket Guide, p6
- ^ Concise encyclopedia of plastics, by Donald V. Rosato, Marlene G. Rosato, Dominick V. Rosato, p621
