Question

Please explain me this one dimensional motion(see it below )

Answer 1

OK..
So you want the clear Definition.
So, in simple words one dimentional Motion is the Motion in a straight line.
We know, motion is the Change in the physical States of a substance.
So when this motion goes on in a straight line, it is refered as one dimentional motion.
For Examples - a Flying Butterfly is not one Dimensional motion because in does Not fly in a straight lime.
But a Running Train is, because it Runs in a straight railway path .

Hope My Answer is explainable to you.

Answer 2

hay,here is talk about one dimensional motion which means no others things include in that motion. like ,
we have example of train which is moving on train. here,for moving train only track is needed or we can earth is needed not sky or other things. let's explain one more thing to you that engine,parts of train are other things we are talking about motion(moving).
I HOPE this will help you for understanding.
thanks