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## Homework Statement

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

mg=mv^2/r

g=v^2/r

v=11

But I dont get why the MINIMUM ac has to be g for them not to fall off.