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Torque is a measure of how much a force acting on an object causes that object to rotate. The object rotates about an axis, which we will call the pivot point, and will label 'O'. We will call the force 'F'. The distance from the pivot point to the point where the force acts is called the moment arm, and is denoted by 'r'.
moment in Mechanical Engineering (moÊmÉnt) A moment is the ability of a force to turn, twist, or bend. It is equal to the force multiplied by the distance from the center of twisting, turning, or bending. Using a long-handled wrench allows a greater moment to be applied to the nut. Torque is the moment of force which tends to twist a structure.