Friction between sliding surfaces is caused

The question seems to be a statement. The statement is true.

Explanation:

Friction (force) is actually a resistance to motion. However, this is the only force that is caused when two surface slides each other and we assume that there is a coefficient of friction, which has some values. In reality every surface has some coefficient of friction. the higher the value the bigger the friction force and the lower the coefficient of friction the lower the friction force.