Question

b. Friction is caused due to
.... of the
irregularities of the surfaces of both objects
that are in direct contact.​

Answer 1

Friction is a force between two surfaces that are sliding, or trying to slide, across each other. For example, when you try to push a book along the floor, friction makes this difficult. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move.