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Why is the friction force proportional to the normal force?

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Physics is first an observational science. Friction proportional to normal force is a model that describes an observation. First you measure frictional force and normal force for a wide range of forces and between a large variety of surfaces. read more

Friction proportional to normal force is a model that describes an observation. First you measure frictional force and normal force for a wide range of forces and between a large variety of surfaces. Then for each pair of surfaces you plot the relationship between the two forces and observe that the relationship is well described by a straight line. read more

Friction is proportional to the force with which an object pushes against the surface you’re trying to slide it along. The forces acting on a bar of gold. As you can see in the figure, the force with which the gold ingot presses against the ground in this situation is just its weight, or mg. read more

Friction and Normal Force Part of the standard model of surface friction is the assumption that the frictional resistance force between two surfaces is proportional to the normal force pressing them together. read more

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