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

Imagine a parachute. It slows you down by catching air. Same thing happens when you jump up on a moving train. You’re catching air which slows you down.

It doesn’t happen on the inside because the air on the inside of the train is moving with you.