Final answer:
Newton's first law of motion is also known as the Law of Inertia, describing how an object will remain at rest or in uniform motion unless acted upon by an external force.
Step-by-step explanation:
Another name for Newton's first law of motion is the Law of Inertia. This law states that in an inertial frame of reference, a body at rest will remain at rest, and a body in motion will continue to move at a constant velocity unless acted upon by a net external force. Inertia is the property that describes an object's tendency to maintain its state of rest or uniform motion. The larger an object's mass, the greater its inertia, hence mass is directly related to an object's inertia.