1. The problem statement, all variables and given/known data I have constructed a small scale roller coaster for my physics class. I was given the task of finding a track design with a safe and enjoyable ride. For times sake I plan to simply calculate the changes in g-force. I am using a hotwheels car and plastic track. I simply need to know how to go about calculating negative and positive vertical g-force. 2. Relevant equations The few I have read about consist of the gravity constant and radius. Realistically radius might not be able to be obtained. 3. The attempt at a solution I collected the mass of the car, and its acceleration throughout the track, but anything past data collection has not taken place.