Galileo's Principle states that the motion of an object is independent of the forces acting on it, as long as those forces are balanced. This means that if an object is in a state of uniform motion, it will continue to move at that constant speed in a straight line unless acted upon by an unbalanced force. This principle laid the groundwork for understanding motion and inertia. Additionally, Galileo Galilei demonstrated that objects fall at the same rate regardless of their mass, provided there is no air resistance. This insight challenged the prevailing beliefs of his time and contributed significantly to the development of classical mechanics.