The first law of motion, also known as the law of inertia, indicates that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an external force. This law implies that, in the absence of external forces, there is no change in an object’s velocity. It emphasizes the idea that an external force is required to alter the state of motion of an object—whether initiating motion, stopping it, or changing its speed or direction. The first law establishes a fundamental connection between an object’s velocity and the presence of external forces.