Amontons' Laws of Friction

Amontons' Laws of Friction describe how two surfaces resist sliding against each other. First, the frictional force is proportional to the normal force pressing the surfaces together; pressing objects harder increases friction. Second, the frictional force remains roughly constant regardless of the sliding speed. Lastly, the type of materials involved affects the friction magnitude, with rougher surfaces generally producing more resistance. These principles help us understand how objects start moving, stay in motion, and require force to change their movement, playing a crucial role in engineering, transportation, and daily activities.