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I believe you are talking about centrifugal force. If I remember correctly, centrifugal force is the outward force while centripetal force is the inward force. These forces are for objects moving about an axis in circular motion. Centrifugal force is also the reason that planets don't fall down to the sun. Gravity pulls down while the speed creates centrifugal force that makes the planets stay up. In the case of the moon, the centrifugal force is the greater of the 2 so the moon is constantly moving away from the earth. Eventually, it will just fly off in to space. Centrifugal force is easily demsontrated by tying an object to a stick using a string and then moving your hand so that the objects revolves around the stick. Unfortunately, I don't know how you would harness this energy in a car. Maybe using some set of counter weights to generates force when you make turns. Seems complicated for the little energy you'd get back.
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