In my book, there is a diagram in which a circular disc is having pure rolling on ground with a clockwise angular velocity 'w'. If we assume friction is absent, then the point of contact of the disc with the ground will tend to move right to left, so friction should act left to right. But, in the diagram, friction is acting from right to left on the point of contact. Please explain. Suppose I apply some torque to the ball and make its angular velocity w. And then I slowly place the ball on the ground. Then, if friction is absent, wouldn't the point of vontact move from right to left if w is clockwise, then shouldn't the friction be from left to right instead?
Because you need some force to oppose motion of point of contact and make its velocity zero such that it continues pure rolling.