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Orange Coast College Physics 185 Dr. Arnold Guerra III Edited by E. Tseng Head-to-Tail Method of Vector Addition I. Introduction. Physical quantities, which require for their complete specification both a magnitudeand directionare vectorquantities. These vector quantities may be represented graphically by a line drawn to scale with the head of an arrow used to indicate the direction. The purpose of this exercise : The student should become thoroughly acquainted with the condition governing the translational equilibriumof a particle. The condition for the translational equilibrium of a particle is that the vector sum of all the