Question

The friction that exists between a surface sliding over another is called ..................

Answer 1

The friction that exists between a surface sliding over another is called kinetic or sliding friction.
When two bodies are in contact, and one body moves on the surface of the other body by sliding on it, the force of dynamic friction that exists in between the two bodies is called sliding friction. The friction existing in between the surface of a glass black and the surface of a table top when the glass block is pushed forwards tells about the sliding friction.