Isaac Newton

In 1687, Isaac Newton published the now famous equation $F=ma$ in his book Philosophiae Naturalis Principia Mathematica now commonly known as the Principia Mathematica. In $F=ma$, $F$ denotes the net force being applied to an object, $m$ denoted the mass of the object and $a$ is the acceleration of the object. This simple principle gives rise to many DEs.