The second law because the first law is an object that is in motion tends to stay in motion, the third law is for every action there is an equal or opposite reaction, The second law is The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
