Calculating the normal force of a roller coaster

[tpopono]

A roller coaster car of mass 960 kg starts at a distance of H = 20 above the bottom of a loop 12 m in diameter. If the friction in negligible, find the normal force of the rails on the car when i it is a) pside down the top of the loop and b) at the bottom of hte loop

i have no idea how to do it, thank you

 

[RU2490]

A roller coaster car of mass 960 kg starts at a distance of H = 20 above the bottom of a loop 12 m in diameter. If the friction in negligible, find the normal force of the rails on the car when i it is a) pside down the top of the loop and b) at the bottom of hte loop

i have no idea how to do it, thank you

Dude, you got to at least attempt

a) The equation is fn+mg= mv^2/r. Both fn and mg point downwards when it is upside down. Just solve for fn

b) at the bottom of the loop fn-mg=mv^2/r