- If the position of an object does not change with time with respect to some reference point then the object is said to be in Rest.
- If the position of an object changes with time with respect to some reference point then the object is said to be in Motion.
- Reference Point/Orgin (O) is a fixed point with respect to
Rest & Motion are relative
- An object may appear stationary to one person and moving to another (or vice versa).
- All Objects which are stationary on the Earth, are said to be in rest with respect to each other, but with respect to Sun/Moon they all are in motion, in fact we all are in motion.
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