The Principles of Motion describe how objects move and interact with forces. These principles include concepts like speed, velocity, acceleration, and inertia. For example, an object at rest will stay at rest unless acted upon by an external force, as stated by Isaac Newton's first law of motion. Additionally, the relationship between force, mass, and acceleration is defined by Newton's second law, expressed as F=ma. This means that the greater the mass of an object, the more force is needed to accelerate it. Understanding these principles helps explain everyday movements, from a rolling ball to a car accelerating on a road.