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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.

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