Which of the following would NOT affect frictional forces?

Frictional forces are influenced by various physical properties and conditions of the surfaces in contact. The texture of the surfaces, for example, plays a significant role in how much grip or resistance there is when two objects slide against each other. Rougher surfaces typically create more friction compared to smoother surfaces.

Moisture can significantly impact friction as well; the presence of water or other lubricants can reduce the coefficient of friction between surfaces, making them easier to slide over each other. Similarly, heat affects friction because temperatures can change the physical properties of materials, potentially melting lubricants or altering surface textures through expansion or softening.

Distance, on the other hand, refers to the physical space between two objects rather than their surface characteristics. The force of friction itself is not directly affected by the distance between the surfaces; rather, it is determined by the nature of the surfaces and any external conditions like moisture or heat present. Therefore, distance is the factor that would NOT affect frictional forces.