Electrons flow in the wire from a(n) terminal to a(n) terminal

-- Charges are attracted to an opposite charge and
repelled from a similar charge.

-- Electrons carry negative charge.

-- Electrons flow in a wire away from an negative terminal
toward an positive terminal.

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.