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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.

Torque force equivalence at one meter leverage

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 travelled 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]

Conversion factorsEdit

See alsoEdit

ReferencesEdit

  1. BIPM - unit symbols
  2. 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".
  3. BIPM - special names
  4. Mechanical Engineering Formulas Pocket Guide, p6
  5. Concise encyclopedia of plastics, by Donald V. Rosato, Marlene G. Rosato, Dominick V. Rosato, p621


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