WHAT IS ACTUALLY MEANT BY FRAME OF REFRENCE? What is point mass??Please help me...i want to get my concept very clear about this please please help me ellaborately!! :D :DIt would be really helpfull!!

Dear Amin,

A frame of reference in physics, may refer to a coordinate system or set of axes within which to measure the position, orientation, and other properties of objects in it, or it may refer to an observational reference frame tied to the state of motion of an observer. It may also refer to both an observational reference frame and an attached coordinate system as a unit.

Point mass (pointlike mass) is an idealistic term used to describe either matter which is infinitely small, or an object which can be thought of as infinitely small. This concept in terms of size is similar to that of point particles, however unlike point particles the object need only be considered infinitely small

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