Definition and Usage of Newton-metre - A newton-metre is the unit of torque or moment in the International System of Units (SI). - It is equal to the torque resulting from a force of one newton applied perpendicularly to a moment arm that is one metre long. - The unit is also used as a unit of work or energy, equivalent to the joule. - The metre term represents the distance travelled or displacement in the direction of the force, not the perpendicular distance from a fulcrum. - Torque and energy expressed in newton-metres can sometimes lead to confusion.

Relationship Between Newton-metre and Joule - One newton-metre of torque is equivalent to one joule per radian. - Newton-metres and joules are dimensionally equivalent in SI base units. - The expression for one newton-metre is 1 Nm = 1 kg·m²/s². - Distinguishing between torque and energy avoids misunderstandings.

Conversion Factors - 1 kilogram-force metre is equal to 9.80665 Nm. - 1 newton-metre is approximately equal to 0.73756215 pound-force-feet. - 1 pound-foot is equal to 1.35581795 Nm. - 1 ounce-inch is approximately equal to 7.06155181 mNm (millinewton-metres). - 1 dyne-centimetre is equal to 10 Nm.

Related Concepts and Units - Bending moment is a related concept to newton-metre. - Spring scale is an instrument that measures forces in newtons. - Torque tester is another related concept to newton-metre. - Newton-second is the derived SI unit of impulse. - The nonstandard notation Nm is sometimes used in certain fields.

References and Additional Information - BIPM provides information on unit symbols. - Eshbach's Handbook of Engineering Fundamentals mentions newton-metre as the basic unit of energy in SI units. - The spring scale is a different instrument that measures forces in newtons. - The concept of torque is related to newton-metre. - The newton-second is another derived SI unit.