Other than distance between the dominoes.|||The height of the dominoes should be the only other factor, assuming gravity is invariable; if we are allowed to choose a location other than the surface of the Earth, then the acceleration due to gravity would also have an effect. The height of the dominoes affects the torque that gravity exerts on them, and thus the speed at which they fall. It also changes the angle through which each domino must fall before hitting the next.
The mass, density, and width of the dominoes does not affect the speed at which they fall, nor does their thickness except as far as it changes the spacing between them, unless the dominoes become so thick that they are unable to fall.
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