non-real forces. For me, I say that if the force is essentially one of the 4 fundamental forces then it is "real". With this definition, centripetal force would be real and centrifugal not real.

Weir is a lifelong space nerd and ... can withstand one g of force (equivalent to the force of gravity on Earth's surface), then start the ship spinning such that the centripetal force is one ...

(note: "talked about" means wrote a blog post) In thinking about centripetal forces, I realized that I could come up with a situation in which the centrifugal force is the centripetal force.

I'm an astronaut based here at the European Space Agency, in Germany ... is something called centripetal force. TIM PEAKE:And for an explanation of what that is, and how it works, here's Dr ...