1. The problem statement, all variables and given/known data In case the numbers are hard to read: Mass of the cart- .5g Initial Velocity- 1.5 m/s The height of the first hill is 2. Radius of the circle- .09m I need to find velocity (final, i think) force(s) on the cart at point A the magnitude of the force(s) at point a Work Non Conservative if there was friction at point A Also answer: How would you change the set up if the car lost contact with point A? 3. The attempt at a solution So, I don't know.. I think I have an idea of how to start? This problem has me so lost. a) To find the velocity, I tried doing EFr=mar EF=m(v^2/r) and then, I wasn't quite sure of the radial forces.. I know that there is gravity obviously, but I didn't know if normal force cancelled out because it was at the top? But I figured this equation was right because i have the mass and radius. b) For the forces on the cart at point A.. again, I have gravity and normal force, but i dont know if force normal cancels out. c) I think I know how to find the magnitude.. Fg=mg and Fn=mg? Fn could be wrong. d) Work non conservative.. would be friction. So, Wnc=(coefficient of friction)(Fn)(displacement) e) and i really dont know how to change the setup, because i don't really know what's going on at point a that would make the car lose contact with the track. thanks for your help!