There are many equations that cannot be solved directly and with this method we can get approximations to the solutions to many of those equations. Newtons second law can be used to describe the acceleration of an object based on total force applied and the mass of the object. Both are inverse-square laws where force is inversely proportional to the square of the distance between the bodies.
The exact relationship is Fma where m is the bodys mass.
Therefore we can calculate the force by the equation. F ma where F Force m Mass and a Acceleration. The acceleration a of a body is directly proportional to the acting force F and inversely proportional to its mass m that is. Newtons Second Law and equation of Force Newtons Second Law states that the rate of change of momentum of a body is directly proportional to the net force applied on it and this change in momentum takes place in the direction of the applied force.