The relationship between body, forces acting upon it, and its motion.
In an inertial frame of reference is when net force is equal to zero = therefore there is no resistance to the object’s velocity.
First law: In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force.
Second law: In an inertial frame of reference, the vector sum of the forces F on an object is equal to the constant mass m of that object multiplied by the acceleration a of the object: F = ma. (mass is assumed constant).
Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.
