I am a bit confused about these accelerations. Anything that rotates has a linear acceleration which is a vector in the same direction as linear velocity . There is also a centripetal acceleration which "pulls" wants to pull the objects towards the axis of rotation. So the sum of these two vectors will be another total acceleration which will be equal to the square root of the sum of a linear and a angular . Therefore, if there is a body of mass m rotating about an axis,it would have a total force of m*(a total) which would always be perpendicular to the distance from the centre of rotation and thus explaining the circular motion.So if we are on a frictionless turntable rotating at a speed ω the centripetal acceleration will have no means (friction or tension )to keep us towards the centre and as a result we would follow the path of the tangential velocity ( V linear ). What i cannot understand is what is a centrifugal force and how it is created and by whom . Does it always exist in a circular motion just like the centripetal acceleration ? My intuition whether it's true or not says that the centrifugal acceleration must always be smaller than the centripetal acceleration otherwise the resultant force would be directed outwards and instead of following the direction of the linear velocity we would "leave" at angle φ to it . What about Newton's laws ? i thought they were always valid !