Eli5: why when I’m standing on a moving train and I jump, the train doesn’t move around me?
In: Physics
[This](https://www.youtube.com/watch?v=pyBNImQkRuk&t=295s) old educational film from the 60’s wonderfully shows the concept. The part about the relative motion of a ball falling on a moving cart starts about 5 minutes into the clip.
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