Define newtons first law of motion?

Answer 1

a body remains at rest or in motion with a constant velocity unless acted upon by external force.

Answer 2

If you are referring to Newtons laws of motion the laws are as follows,

1. First law: Every body remains in a state of rest or uniform motion (constant velocity) unless it is acted upon by an external unbalanced force. This means that in the absence of a non-zero net force, the center of mass of a body either remains at rest, or moves at a constant speed in a straight line.
2. Second law: A body of mass m subject to a force F undergoes an acceleration a that has the same direction as the force and a magnitude that is directly proportional to the force and inversely proportional to the mass, i.e., F = ma. Alternatively, the total force applied on a body is equal to the time derivative of linear momentum of the body.
3. Third law: The mutual forces of action and reaction between two bodies are equal, opposite and collinear. This means that whenever a first body exerts a force F on a second body, the second body exerts a force −F on the first body. F and −F are equal in magnitude and opposite in direction. This law is sometimes referred to as the action-reaction law, with F called the "action" and −F the "reaction". The action and the reaction are simultaneous.

Answer 3

Every body continues in its state of rest or of uniform motion in a straight line, unless it is compelled to change that state by an external source, impressed upon it.

Answer 4

an object in motion will stay in motion unless a force is acted upon it, and an object at rest will stay in rest unless a force is acted upon it.

Answer 5

Newtons first law of motion states that an object in motion will stay in motion and an object at rest will say at rest.

Answer 6

an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction, unless acted upon by an unbalanced force

Answer 7

Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force.