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Centrifugal force is force that pulls rotating object away from the center of rotation, Centrifugal is part of Newtonian mechanics and it's derived from Newton's Second law $$F=ma$$ Where $F$ is force in newtons, $m$ is mass of an object and $a$ is acceleration. In circular motion acceleration is $a=\frac{v^2}{r}$ and full equation for centrifugal force is $$ F=\frac{mv^2}{r} $$ Where $v$ is speed and $r$ is radius. Here's sample image of circular motion and centrifugal and centripetal force acting on an object:

http://cdn4.explainthatstuff.com/centrifugal-centripetal-compared.png

Same happens with pilots of jet planes:

They experience centrifugal force and if that force is enough they can lost consciousness.

EDIT:

Imagine a bus and someone who is standing in it, and suddenly the bus driver turns the bus, because the car changed its direction of velocity it has accelerated, while someone who was standing was continuing moving in old direction, because of that he/she will fall, but because of bus driver is sitting very hardly he will experience centrifugal force. It's easier to imagine a spaceship, if he/she was floating relative to spaceship and spaceship has changed its direction of motion, it will accelerate, while he/she will be continuing moving in old direction so he/she won't experience centrifugal force, while spaceship will. (I have found nice animation about that situation in spaceship Click Here.)

Centrifugal force is force that pulls rotating object away from the center of rotation, Centrifugal is part of Newtonian mechanics and it's derived from Newton's Second law $$F=ma$$ Where $F$ is force in newtons, $m$ is mass of an object and $a$ is acceleration. In circular motion acceleration is $a=\frac{v^2}{r}$ and full equation for centrifugal force is $$ F=\frac{mv^2}{r} $$ Where $v$ is speed and $r$ is radius. Here's sample image of circular motion and centrifugal and centripetal force acting on an object:

_{(source: explainthatstuff.com)}

Same happens with pilots of jet planes:

They experience centrifugal force and if that force is enough they can lost consciousness.

EDIT:

Imagine a bus and someone who is standing in it, and suddenly the bus driver turns the bus, because the car changed its direction of velocity it has accelerated, while someone who was standing was continuing moving in old direction, because of that he/she will fall, but because of bus driver is sitting very hardly he will experience centrifugal force. It's easier to imagine a spaceship, if he/she was floating relative to spaceship and spaceship has changed its direction of motion, it will accelerate, while he/she will be continuing moving in old direction so he/she won't experience centrifugal force, while spaceship will. (I have found nice animation about that situation in spaceship Click Here.)

Centrifugal force is force that pulls rotating object away from the center of rotation, Centrifugal is part of Newtonian mechanics and it's derived from Newton's Second law $$F=ma$$ Where $F$ is force in newtons, $m$ is mass of an object and $a$ is acceleration. In circular motion acceleration is $a=\frac{v^2}{r}$ and full equation for centrifugal force is $$ F=\frac{mv^2}{r} $$ Where $v$ is speed and $r$ is radius. Here's sample image of circular motion and centrifugal force acting on an object:

http://www.calctool.org/CALC/phys/newtonian/centrifugal.png

where $a = \omega^2r$ and $\omega$ is circular speed measured in rad/sec.

Same happens with pilots of jet planes:

They experience centrifugal force and if that force is enough they can lost consciousness.

EDIT:

Imagine a bus and someone who is standing in it, and suddenly the bus driver turns the bus, because the car changed its direction of velocity it has accelerated, while someone who was standing was continuing moving in old direction, because of that he/she will fall, but because of bus driver is sitting very hardly he will experience centrifugal force. It's easier to imagine a spaceship, if he/she was floating relative to spaceship and spaceship has changed its direction of motion, it will accelerate, while he/she will be continuing moving in old direction so he/she won't experience centrifugal force, while spaceship will. (I have found nice animation about that situation in spaceship Click Here.)

Centrifugal force is force that pulls rotating object away from the center of rotation, Centrifugal is part of Newtonian mechanics and it's derived from Newton's Second law $$F=ma$$ Where $F$ is force in newtons, $m$ is mass of an object and $a$ is acceleration. In circular motion acceleration is $a=\frac{v^2}{r}$ and full equation for centrifugal force is $$ F=\frac{mv^2}{r} $$ Where $v$ is speed and $r$ is radius. Here's sample image of circular motion and centrifugal and centripetal force acting on an object:

http://cdn4.explainthatstuff.com/centrifugal-centripetal-compared.png

Same happens with pilots of jet planes:

They experience centrifugal force and if that force is enough they can lost consciousness.

EDIT:

Imagine a bus and someone who is standing in it, and suddenly the bus driver turns the bus, because the car changed its direction of velocity it has accelerated, while someone who was standing was continuing moving in old direction, because of that he/she will fall, but because of bus driver is sitting very hardly he will experience centrifugal force. It's easier to imagine a spaceship, if he/she was floating relative to spaceship and spaceship has changed its direction of motion, it will accelerate, while he/she will be continuing moving in old direction so he/she won't experience centrifugal force, while spaceship will. (I have found nice animation about that situation in spaceship Click Here.)

Centrifugal force is force that pulls rotating object away from the center of rotation, Centrifugal is part of Newtonian mechanics and it's derived from Newton's Second law $$F=ma$$ Where $F$ is force in newtons, $m$ is mass of an object and $a$ is acceleration. In circular motion acceleration is $a=\frac{v^2}{r}$ and full equation for centrifugal force is $$ F=\frac{mv^2}{r} $$ Where $v$ is speed and $r$ is radius. Here's sample image of circular motion and centrifugal force acting on an object:

Same happens with pilots of jet planes:

They experience centrifugal force and if that force is enough they can lost consciousness.

EDIT:

Imagine a bus and someone who is standing in it, and suddenly the bus driver turns the bus, because the car changed its direction of velocity it has accelerated, while someone who was standing was continuing moving in old direction, because of that he/she will fall, but because of bus driver is sitting very hardly he will experience centrifugal force. It's easier to imagine a spaceship, if he/she was floating relative to spaceship and spaceship has changed its direction of motion, it will accelerate, while he/she will be continuing moving in old direction so he/she won't experience centrifugal force, while spaceship will. (I have found nice animation about that situation in spaceship Click Here.)

Centrifugal force is force that pulls rotating object away from the center of rotation, Centrifugal is part of Newtonian mechanics and it's derived from Newton's Second law $$F=ma$$ Where $F$ is force in newtons, $m$ is mass of an object and $a$ is acceleration. In circular motion acceleration is $a=\frac{v^2}{r}$ and full equation for centrifugal force is $$ F=\frac{mv^2}{r} $$ Where $v$ is speed and $r$ is radius. Here's sample image of circular motion and centrifugal force acting on an object:

http://www.calctool.org/CALC/phys/newtonian/centrifugal.png

where $a = \omega^2r$ and $\omega$ is circular speed measured in rad/sec.

Same happens with pilots of jet planes:

They experience centrifugal force and if that force is enough they can lost consciousness.

EDIT:

Imagine a bus and someone who is standing in it, and suddenly the bus driver turns the bus, because the car changed its direction of velocity it has accelerated, while someone who was standing was continuing moving in old direction, because of that he/she will fall, but because of bus driver is sitting very hardly he will experience centrifugal force. It's easier to imagine a spaceship, if he/she was floating relative to spaceship and spaceship has changed its direction of motion, it will accelerate, while he/she will be continuing moving in old direction so he/she won't experience centrifugal force, while spaceship will. (I have found nice animation about that situation in spaceship Click Here.)