Why doesn Centrifugal Force cancel out Centripetal Force acting on a stone in circular motion?
That’s an excellent point. The explanation is that there ISN’T ANY “ceftrifugal force” acting on the stone. The frame of reference that most physics books choose is an inertial frame in which the stone is seen to move in a circle. In that frame, there’s only one force–it’s centripetal, and it’s due to the tension of the string. This force causes the stone’s direction of motion to continually change, in accordance with Newton’s laws. There isn’t any force pulling OUTWARD on the stone. There IS, however, a force pulling outward on the STRING. This agrees with Newton’s 3rd Law; which says that as the string pulls inward on the stone, then the stone must pull outward on the string. This is sometimes confused as meaning that something is pulling outward on the stone as well; but that’s not the case. An alternate way to look at it is from a reference frame that that is moving along with the stone (e.g., pretend you have a little laboratory set up on the stone, and you make your measurements
