Refers to the motion of an object must be specied at all times from a reference point​

Say you have been blind from birth ( forgive me )and have your vision has returned by an operation today. You are returning home by a metro. As you get seated, soon you see something real strange. The track has started moving backwards! Its accelerating backwards with a very high speed and soona station approaches your metro and it stops there.

You say, how weird is this world!!!

This is what gives you an intuitive Introduction of reference points and relativity ( no not that Einstein one, relativity of motion ).

Lets take another example. You are moving in a car, and another car, moving with a slower speed, seems to approach towards you even if both the cars are moving in the same direction if a man standing beside on ground sees them. And you're like : I want to go blind again.

The point is , if you see motions with different reference points, you see different motions.

You in the car moving with 50mph (wrt man on ground)and would see the car moving with 30mph (wrt man in ground) approaching you with 20mph, while the person in that car would see you overtaking him with 20mph

So, motions are not defined well, to define them, we also need to tell from which reference point are we telling the motion, other wise while sky diving, you can say that the earth is accelerating towards you with 10m/s^2
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