How to find G's

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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.
 

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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.
 
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