Hey guys, we have just finished Chapter 10 (Rotation) and I have some questions regarding some of the concepts. For an object to rotate about some axis, any given particle at point P at some radius "r" has a linear velocity (tangential velocity) and linear acceleration (tangential acceleration). Now, I know that for a particle/object undergoing uniform circular motion, it has a velocity tangential to is radial acceleration. However, how come when you have it rotating about a fixed axis, it has both a tangential acceleration and radial acceleration? Furthermore, they say that the acceleration of the object is the magnitude of both tangential and radial acceleration? Is this magnitude "a" supposed to be the actual acceleration of the particle/object if it was traveling in a linear motion? Or is it because of the fact that a = delta v / delta t? Thanks.