Some important definitions Displacement R=Reio Linear displacement:All particles of a body move in parallel planes and travel by same distance is known as linear displacement Angular displacement:A body rotating about a fixed point in such a way that all particles move in circular path is known as angular displacement yImaginary axis Real axis Some important definitions Velocity-Rate of change of displacement is velocity.Velocity can be linear velocity or angular velocity. First order: d(Re)=ke+R(ej0)-keRoje d de Angular Velocity:@ dt yAImaginary axis Linear Velocity:V= dR R R dt Real axis R 22 Displacement Linear displacement: All particles of a body move in parallel planes and travel by same distance is known as linear displacement Angular displacement: A body rotating about a fixed point in such a way that all particles move in circular path is known as angular displacement Some important definitions j R e  R  Velocity - Rate of change of displacement is velocity. Velocity can be linear velocity or angular velocity. Some important definitions First order: ( ) ( )= d j jj j j R e Re R e j Re R j e dt             Angular Velocity: d dt    Linear Velocity: d dt V  R