Torque

Newton metre is a unit of torque (also called "moment") in the SI system. The symbolic form is N m or N·m, 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. Read more >>

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In physics, torque (or often called a moment) can informally be thought of as "rotational force" or "angular force" which causes a change in rotational motion. This force is defined by linear force multiplied by a radius. The SI unit for torque is the newton metre (N m). In U.S. customary units, it is measured in foot pounds (ft·lbf) (also known as 'pounds feet'). The symbol for torque is τ, the Greek letter tau. Read more >>