A ball at the end of a rope is swung in a circle that is parallel to the ground. If the ball is then swung around in a circle that is perpendicular to the ground, which of the following statements is true? Assume the speed and length of rope are the same in both cases.

Question

A ball at the end of a rope is swung in a circle that is parallel to the ground. If the ball is then swung around in a circle that is perpendicular to the ground, which of the following statements is true? Assume the speed and length of rope are the same in both cases.
  Perpendicular circle has a different total centripetal force. 
  Weight force is independent of the parallel circle's motion. 
  The accelerations are different 
  The tension in the rope is the same for both cases.

R_scott · Accepted Answer

Weight force is independent of the parallel circle's motion.

ko · Answer

THanks R_scott. BUt can you expain for me why.