Question

define force of friction

Answer 1

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

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Answer 2

Frictional force is the opposing force that is created between two surfaces that try to move in the same direction or that try to move in opposite directions. The main purpose of a frictional force is to create resistance to the motion of one surface over the other surface. The frictional force depends on the body surface textures.