As the title implies, this post is about gravity. It is not so much about the force of gravity, but gravity as an acceleration field having a constant parameter referred to as the gravitational constant, denoted G, which is otherwise known as Newton’s gravitational constant. This constant appears in Newton’s gravitational law and in Einstein’s theory of general relativity. Though it features in both Newtonian & Einsteinian definitions of gravity, its physical significance remains ambiguous.
In this post, I shall reveal its physical significance in simple language and very little mathematics, but in accordance with the definition of the atom, which I covered in my post Anatomy of Atoms and which is based on the UP hypothesis.
In Newtonian physics gravity is defined as radial acceleration produces by an object towards its centre of mass. Therefore, any object that has mass has a gravitational field. Based on this definition, any material object entering the gravitational field of another is immediately attracted to it and attracts it. The question of what constitutes a physical field and causes matter to accelerate has never been answered satisfactorily and therefor the nature of gravity has remained ambiguous! Continue reading “G is for Gravity”