ELI5, why if you jump inside a moving train you will land on the same spot, but if you jump on the roof of a moving train, you land on a different spot?

Question

seen it on twitter and I can’t get my head around it
EDIT: thanks guys I get it now 😅

In: Physics

Answer 1

Everything inside the train is moving at the speed of the train. This is not the case outside of the train. Outside the train, the train is moving faster then the air surrounding the train. So, essentially you are pushed back by the air surrounding the train.

TLDR – the air surrounding the train pushes you back if you are outside the train.