F = m.a and Sacred Science Book

Force is equal to mass multiplied by acceleration happen to the mass. This equation is known as Second Law of Newton; and yes, it's founded by Father of Modern Physics, Sir Isaac Newton (father of modern physics also often referred to Galileo Galilei). Newton Law is introduced in his book, Principia. This book also contain his famous gravity law and Newton Law from one to three. 

Principia Book Cover

His most famous book, Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) is written by Sir Isaac Newton and published in  5 July 1687.  The four most famous physics law (and the most often show up in your school physic book) and equation are become from this book. So this is the four equation that founded by Isaac Newton :

1) Gravity Law

The story told us that an apple fell down to Newton's head under it, and made Newton think, what makes an apple fell straight downward, not upward or fell aside. And that's how Newton found gravity according to the "story". The formula of Gravity Law is :

2) First Law of Newton

First law of Newton state : Every object will maintain a state of rest or move in an orderly straight, unless there is a force acting to change it. If the resultant of total force is equal to zero, object will maintain it's position and vector. The equation is :

3) Second Law of Newton

Second law of Newton stated the change of motion is always directly proportional to the force generated / worked, and has the same direction as the normal line from the point of contact of the force of the object

An object with mass m experiences a resultant force of F will experience acceleration a in the same direction as the direction of the force, and its magnitude is directly proportional to F and inversely proportional to M. The equation is :

4) Third Law of Newton

Third law of Newton stated for every action there is always an equal and opposite reaction: or the forces of two objects on each other are always the same and in opposite directions". The equation is :

The forces of action and reaction of two objects have the same magnitude, in opposite directions, and are linear.