Hello all! I'm having some difficulty understanding one of the concepts of angular motion. My textbook tells me that the total linear acceleration of a point in a rotating body is the vector sum of tangential acceleration and centripetal acceleration. However, later on in the chapter, there is an example problem using a rotating rod where we are supposed to find the linear acceleration of the tip of the rod. I thought that linear acceleration = tangential acceleration + centripetal acceleration, but for this example it says that linear acceleration = tangential acceleration. I don't see how they could suddenly ignore the centripetal acceleration?? Any explanation would be appreciated! Thank you.