Definition: The product of force and lever-arm distance, which tends to produce rotation. 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. The SI derived unit commonly use for torque is the newton metre. Alhough a newton metre is dimensionally equal to a joule (SI unit of energy and work), it is not appropriate to express a torque in joules. Energy and work is a scalar quantity while torque is a vector quantity (pseudovector).

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