ENERGY Lecture Notes 1 WORK AND ENERGY 1. Work (W,A): Work = Parallel Force x Displacement sFW parallel = Note 1: Work is a scalar quantity. It does not have direction. Note 2: We can use the formula above only if the force is constant along the distance. 1J = 107 erg Therefore: 1J = 1 N m. Ex: Find the work done by the force. Ex: Find the work done by the man on the weights as he holds the them at fixed position for two hours. [The man is consuming energy but this energy is not transferred to the weights.] Ex: WF= Fperpend s WF = (F Cos?) s (General formula) Attention: The component perpendicular to the displacement does not do work. Ex: Find the work done on the object (by