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_{0}. And as long as no acceleration is applied onto the object, it will continue move at the same speed and direction forever.

For uniform circular motion to happen, an object must move at a constant speed v

_{0}with a constant perpendicular acceleration of magnitude v

^{2}/r. This perpendicular acceleration always points toward the center of circular path. However, something must continuously provide the centripetal force for the perpendicular acceleration otherwise the object will become a linear motion instead.

What about rotational motion? I know that just line linear motion, if an object is spinning at a constant angular speed w

_{0}; it will keep spinning at that constant speed forever if no angular acceleration is applied. However, centrifugal force must be present for rotational objects. How can the object provide itself centrifugal force with no external influence?