Class 8 - Friction

Features

• Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
• Frictional resistance to the relative motion of two solid objects is usually proportional to the force which presses the surfaces together as well as the roughness of the surfaces.
• Since it is the force perpendicular or "normal" to the surfaces which affects the frictional resistance, this force is typically called the "normal force" and designated by N.

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