How do I find gravitational force in a roller coaster problem?

[Thefizz29]

This may seem like a really stupid question but i forgot how to find Gravitational force like in a roller coaster problem. I know how to find centripetal acceleration and centripetal force if that even matters but i could use some help please.

 

[cesiumfrog]

G's is the magnitude (in units of the magnitude of sea-level gravitational acceleration) of the vector difference between one's acceleration and free-fall. (This often isn't obvious before considering GR.) It's the multiple that your weight changes by, if you bring on the rollercoaster a bath scale to sit on.