Answer:

Newton's first law of motion states that there must be acause—which is a net external force—for there to be anychange in velocity, either a change in magnitude or direction. An object sliding across a table or floor slows down due to the net force of friction acting on the object

Verified answer

Answer:

Newton’s first law: the law of inertia

Newton’s first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. In fact, in classical Newtonian mechanics, there is no important distinction between rest and uniform motion in a straight line; they may be regarded as the same state of motion seen by different observers, one moving at the same velocity as the particle and the other moving at constant velocity with respect to the particle. This postulate is known as the law of inertia.

Hope it will help you