and if possible, how does inertia play (or not play) a part in this?
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>and if possible, how does inertia play (or not play) a part in this?
The air inside of a train is moving at the speed of the train.
The air outside of a train is not moving at the speed of the train.
A person standing on top of a train is experiencing wind according to the speed at which the train is moving – and all forces associated with that. A person inside the train is not experiencing any wind.
This is caused by the inertia of the air. It resists being moved by the train/person pushing through it.
Jumping on top of a train within a vacuum would yield that same result as jumping inside that train.
Wind resistance, when you jump in a train, all the air around you is relatively motionless, you and the air are moving at the same speed. When you’re on the roof of a train, you are going at the speed of the train and the air is moving at whatever speed and direction it happens to be moving at.
So when you jump and are no longer being propelled forward by the train, the air pushes you.
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