* Friction: This is the force that opposes motion between two surfaces in contact. You experience friction when you rub your hands together, when a car brakes, or when a book slides across a table.

* Normal Force: This is the force that a surface exerts on an object that is resting on it. It's always perpendicular to the surface. You experience this when standing on the ground (the ground pushes back up on you) or when an object is placed on a table (the table pushes back up on the object).

Let me know if you'd like more examples!