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Alright, thank you

I think I understand now. So the normal force is the force equal and opposite to weight and perpendicular to the contact force. "Friction" is the pair of forces parallel to the contact surface?

O.K, so if I understand you correctly the friction IS the equal and opposite force from the third law?

Hello, I have a question from a conceptual problem in my textbook as follows: A car is moving north and speeding up to pass a truck on a level road. The combined contact force exerted on the road by all four tires has vertical component 11.0 kN downward and horizontal component 3.3 kN...