A Matrix represents three component forces and three component torques acting between two bodies in particular directions. A Matrix object supports three types of spring, damping and actuating forces. Two bodies, and locations on the bodies must be specified to create the force. A Matrix calculates its force and torque based on the relative displacement and angle between the two markers. The action force and torque are applied to the action marker and an equal and opposite reaction force is applied to the base marker. The reaction torque at the base marker is usually not equal to the action torque because of the force transfer. Unlike a Bushing, since the off-diagonal term in the stiffness matrix can be defined, a Matrix is better suited to represent structural flexibility. A Matrix can therefore be widely used to represent a structural beam.