Small electric motor to power something along a track?
I thought first of making a center pole with an extension cord coming out, but as the cart continues in circle, the cord would twist and twist then knot.
I then thought I could power the wheels with a car batter(ies). However, I don't know the first thing about how long a charged battery would be able to power a light motor, etc. I don't know the first things about electricity, so any help or reference material would be appreciated.
Is there a better way to do this? A rotating plug on the pole, for example? Simple diagrams to show how?
Thank you so much!