gravity is the natural force. centrifugal force defies gravity cause by an acceleration from an outside, not normal, force.
Example:
Everything wants to get pulled into the sun... that is the gravity created by the sun in the solar system. Now earth spins at approximately 24 hours creating our full day. It takes approximately 365 days for the earth to orbit the sun. Now if some outside force accelerated the orbit of the sun to cut that orbit in half, we would not be approximately 150,000,000 kilometers but more like 250,000,000 kilometers.
Closer to mars (which if you didn't know, is further from the sun). That is centrifugal force. A force which defies gravity in the opposite direction.
Similar to a david and goliath sling shot
