Which term describes the force that resists motion between a moving object and the surface?

• A. Friction
• B. Force
• C. Attract
• D. Mass

Answer: (A)

Friction is the force that resists motion between two surfaces in contact. It acts opposite to the direction of movement, which is why a moving object slows down or stops when it rubs against a surface. This resistive force comes from the roughness of the surfaces and the microscopic interactions between them, and it can vary with how hard the surfaces are pressed together and how smooth or rough they are. More pressing force or rougher surfaces typically increase friction, while lubrication or smoother surfaces reduce it. Other terms don’t describe this specific interaction: a force is a general push or pull, attract refers to forces that pull objects toward one another, and mass is the amount of matter in an object, which relates to inertia but not the resistance between surfaces.