According to this law, the net force acting on a body is equal to the product of mass and acceleration. The fundamental law that correlates force and motion is Newton’s second law. The Newton-Euler equation governs the motion of humanoid robotsįorces and motion are related. Newton-Euler equations give the relationship between the motion of the center of gravity of a rigid body with the sum of forces and moments acting on the rigid body. Newton-Euler equations are the fundamental equations used in classical mechanics to describe the combined rotational and translational dynamics of a rigid body. Rigid bodies retain their shape irrespective of the force applied to them.