The force that keeps two objects touching from easily sliding past each other is friction.

Here's a breakdown:

* Friction is a force that opposes motion between two surfaces in contact. It arises from the microscopic irregularities and interactions between the surfaces.

* Types of Friction:

* Static friction: This acts when the objects are at rest relative to each other, preventing them from moving.

* Kinetic friction: This acts when the objects are moving relative to each other, resisting the motion.

* Factors Affecting Friction:

* Nature of the surfaces: Rougher surfaces have higher friction than smooth surfaces.

* Force pressing the surfaces together: The greater the force, the greater the friction.

So, the next time you push a heavy box across the floor, you're fighting against friction!