what occurs when the irregularities of one surface come into contact with those os another surface
A snow-packed surface or a metal firehouse pole may seem quite smooth. But, as you can see in Figure 5, even the smoothest objects have irregular, bumpy surfaces. When the irregularities of one surface come into contact with those of another surface, friction occurs. Friction acts in a direction opposite to the direction of the objectâs motion. Without friction, a moving object might not stop until it strikes another object.