Which of the following options gives the correct definition for Sliding friction?

The minimum force required to make a body slide over the surface equals the sliding friction.

The frictional force is the force that resists a body's motion while moving on a surface. When a force is applied to an object to move it, and it does not move, the force applied is balanced by the force of friction. This is called static friction. The friction is reduced when a roller is used to roll on the objects.