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A force is a push or pull that can cause an object to accelerate. It has both magnitude and direction, and is typically measured in units of Newtons (N).
A moment is the turning effect of a force around a specific point, also known as the pivot point or fulcrum. It is calculated by multiplying the force by the distance from the pivot point to the line of action of the force.
A moment and a force are different in that a moment is a rotational force, while a force is a linear force. Additionally, a moment depends on the distance from the pivot point, while a force can act at any point on an object.
A couple is a pair of equal and opposite forces acting on an object, but not along the same line of action. This creates a moment that causes the object to rotate. A couple does not cause any translational motion.
The resultant force of a couple can be found by adding the two forces together. The resultant moment can be calculated by multiplying the distance between the two forces by the magnitude of one of the forces. The direction of the resultant moment is perpendicular to the plane of the couple.