I don't think it must. If you're talking about vertical circular motion, and something like a roller coaster on a track, when it's upside down, you must always have a normal force >=0, or else the car comes off the tracks, if that's what you are referring to.
Thrilled to hear it helped you out!
Glad to hear they're helping!
Thanks! Your videos always help me out :)
My pleasure!
Thanks! What a nice compliment!
i wish u were my physics teacher....
Thank you very much, this is very very helpful ^_^
Thank You!!!
David, I like your videos...can I use them for teaching?
+Barrack Obama Hi Barrack. I'm Dan. :-)
why must the centripetal acceleration exceed or equal g?
I don't think it must. If you're talking about vertical circular motion, and something like a roller coaster on a track, when it's upside down, you must always have a normal force >=0, or else the car comes off the tracks, if that's what you are referring to.
The height final isn't (h-2R) ?
Correct, it must be greater than 2.5R.