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...ons'''. The distance between two objects is measured between their centers of mass. ...e two objects, divided by the square of the distance between their centers of mass. ...

...o deal with, and create an equation that can deal with an arbitrary number of bodies. All of the bodies together are known as a '''system of bodies''', and it is assumed that no external forces are acting on the syst ...

...r gravitational fields that are not uniform and how to calculate the value of <math>g</math> for any given mass. ==Gravity as a field of force== ...

...t angles to their direction of travel, towards the other train. This pulse of light is reflected between the two mirrors over and over again. <p>The first part of the diagram represents what the observer who sent the light sees - the ligh ...

...l path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.'' Albert Einstein ==What is a law of nature ? Introduction == ...

...ment of the object-independent mathematical path followed by the treatment of the object itself. Topics will be rearranged, fleshed-out, etc. as the sec ...damental nature of the universe. It is possibly the most important branch of physics in that without it physics would stagnate and no new discoveries or ...