What is "centrifugal force"?

What is "centrifugal force"?

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Centrifugal force is kind of like the opposite of centripetal force. And centrifugal force is a force pulling out. The best answer I can think of is they use to have devices were they would train astronauts and they would sit in these little compartments and it was like being put in a blender and they would spin around in a circle and that outward force will actually pull their face back like this and make them really look ugly and strange and that outward pulling force is centrifugal force.