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Static friction is the force that opposes the initiation of motion between two surfaces in contact and acts when the surfaces are at rest relative to each other. It can vary in magnitude up to a maximum value, determined by the coefficient of static friction and the normal force. Kinetic friction, on the other hand, acts when the surfaces are sliding against each other and is typically less than the maximum static friction. The coefficient of kinetic friction is usually lower than that of static friction.