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See also moment (mathematics) for a more abstract concept of moments that evolved from this concept of physics.

In physics, the moment of force (often just moment, though there are other quantities of that name such as moment of inertia) is a quantity that represents the magnitude of force applied to a rotational system at a distance from the axis of rotation. The concept of the moment arm, this characteristic distance, is key to the operation of the lever, pulley, gear, and most other simple machines capable of generating mechanical advantage. The SI unit for moment is the newton meter (Nm).

Moment = Magnitude of Force x Perpendicular distance to the pivot (Fd)