Which of the following are factors that influence friction between sliding surfaces?

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Friction between sliding surfaces is controlled by how hard the surfaces are pressed together, the interaction between the contacting materials, and how temperature affects that interaction. The frictional force is roughly F = μN, where N is the normal (pressing) force and μ is the coefficient of friction that describes how the surfaces slide against each other. Increasing the pressing force increases friction; temperature can change the surface properties or lubricant state and thus alter μ, changing the amount of friction. These three factors—pressing force, temperature, and the coefficient of friction—cover the main ways friction is influenced. Other options mix in elements that don’t directly change friction (like surface color or ambient lighting) or describe dynamic conditions rather than the fundamental sliding interaction.