This presentation will focus on the topic of the Apparent Center of Gravity in a rigid body and that would be an introduction to the Apparent Center of Gravity in ocean going vessels. The subtopics of this presentation consist of Partially Submerged Rigid Body, Applying a Force into the Rigid Body, Buoyant Force of the Rigid Body, Buoyant Force Change, Weight of the Rigid Body, Added Mass of The Rigid Body, Weight of The Rigid Body, Apparent Center of Gravity, Drag Force of The Rigid Body, Scale Reading Of The Rigid Body, Varying External Force, External Moment of the Rigid Body, Translational Accelerations, Rotational Acceleration, Varying External Forces & Moments of the Rigid Body, Translational and Rotational Accelerations, Waves in Fluid Surface, Assuming the Rigid Body is a Ship, Forces and Moments in Waves, Accelerations in Waves, and The Center Of Gravity.