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Message: [QUOTE="Ace McCool, post: 221625, member: 18271"] I still disagree. With the rock and the string example, you've got your factors mixed up. The rock is like the person and the string is like the car door. When you start the rock spinning, the rock wants to travel in a straight line (if it came off the string it would travel in a straight line) but the string keeps it from shooting off. The centrifugal force, which is felt, is not the rock moving outward but the tension on the string is from the force you need to apply to pull the rock inward; to keep it from shooting off. Centrifugal force in this case as well as with the car is just the felt force of centripetal force. [/QUOTE]