1. Angular Quantities( P235-238 Angular position 0 2 Angular displacement(角位移):△6=62-61 Where ae is positive for counterclockwise rotation and negative for clockwise rotation Always:0=6t △ede 3.Angular velocity: @=lim 4→+0△tdt Right-hand-rule: When the fingers of the right hand are curled around the rotation axis and point in the direction of the rotation then the thumb points in the direction of1. Angular Quantities (P235-238) 1.Angular position  : 2.Angular Displacement(角位移): Where  is positive for counterclockwise rotation and negative for clockwise rotation. Always:  = (t)  = 2 −1 t t t d d lim 0    =   =  → 3.Angular Velocity : Right-hand-rule: When the fingers of the right hand are curled around the rotation axis and point in the direction of the rotation, then the thumb points in the direction of . (p241) 