To Stand on Charn

Since C.S. Lewis showed us a world on the other side of a wardrobe (and perhaps before), fantasy and science-fiction stories have abounded with this idea of traveling to parallel universes and experiencing strange new worlds.  It's almost iconic: awkward teenager struggling in school and with bullies, gets sucked in to an alternate magical world, meets fascinating elves and confronts evil, and finds confidence to face real-world issues on his or her return.

Typical example

So here's my question: how do they interact with matter in the alternate universe?

Virtual Aristotelian Physics

I spent several hours the other day looking up some sort of reference to a computer simulation of Aristotelian physics.

The thought came to me in connection to fantasy worlds.  Good fantasy authors will create their own fictional worlds with different histories, cultures, languages, and religions, similar to Tolkien's Lord of the Rings.  Lately authors have started going kind of crazy, and have been experimenting with alternative physics, like flat earths and sentient quanta.

I was thinking, why not Aristotelian physics?  Is it that impossible?  A professor of an old friend of mine, remarking to a room of Thomistic philosophy students, asked why they were so enamored with Aristotle when you couldn't make your car run on Aristotelian physics.  Maybe not their cars, but any car?  Can a car run in a world of Aristotelian physics?

Aristotle with impetus