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Static Friction = opposite, or equal force. friction stops forces kinetic Friction force- force exerted on one surface by the other when the surfaces are relative motion. The magnitude force is proportional to the magnitude of the force pushing. kinetic friction force = Ff, kinetic = MKFN Mk = kinetic coefficient The SI unit measures for electrical charge is a coalomb(c) Charge of proton is +1.6x10-19C Charge of 1electron is -1.6x10-19C The charge of partlicle is not a vector quantity positive or negative that tells you if is a proton or electron, but it is not part of the magnitude of the charge Do not put the negatives im the formula, sample problem.