Question

In one line simple sentence for each, state four implications of Newton's first law of motion

Answer 1

Newton's first law demonstrates ideas of force and motion.

Newton's First Law contains implications about the fundamental symmetry of the universe in that a state of motion in a straight line must be just as "natural" as being at rest.

If an object is at rest in one frame of reference, it will appear to be moving in a straight line to an observer in a reference frame which is moving by the object.

There is no way to say which reference frame is "special", so all constant velocity reference frames must be equivalent.