Is centrifugal force a real force?

State whether the following statements are true or false by writing T/F against them.

(a) Earth moves around the Sun with a uniform velocity.

(b) The motion of Moon around Earth in a circular path is an accelerated motion.

(c) A uniform linear motion is unaccelerated, while a uniform circular motion is an accelerated motion.

(d) In a uniform circular motion, the speed continuously changes because the direction of the motion changes.

(e) A boy experiences a centrifugal force on his hand when he rotates a piece of stone tied at one end of a string, holding the other end in the hand.

What is Centripetal force?

Explain the motion of a planet around the Sun in an elliptical path.