A roller coaster loop has a radius of 12m. If the passengers in a car are not to fall out at the top of the loop, what is the minimum speed the car must have at the top?
The Attempt at a Solution
Alright I think I got the right answer but I do not completly understand the question.
so what i did was
I went Fc=Fg (but why??)
g is 9.8
But I dont get why the MINIMUM ac has to be g for them not to fall off.