I have a big confusion. There is a question in my book which basically says that a ball is tied to a string and rotated. and it asks me to tell whether the following statement is true of false. Direction of radial acceleration MAY remain the same. This statement is true. Please explain to me a case where this is possible. i thought that this is only when an object moves straight and in circular motion radial acceleration is towards the centre.
There exists no case where radial acceleration does not change direction.
But i thought of a quite eccentric stuff like this where it appears that it does not change direction.Suppose as the ball tied to the string revolves,there is an observer who is moving along with the string facing the ball.Then, in that frame of reference the direction does not change.
Note:The observer must not be placed on the ball-then relative acceleration becomes 0.