A roller coaster car of mass 1500 kg starts a distance H = 25 m above the bottom of a loop 15 m in diameter (Figure 7-24). If friction is negligible, find the downward force of the rails on the car when it is upside down at the top of the loop.(adsbygoogle = window.adsbygoogle || []).push({});

Uhm iwell i figured out the KE and the PE at the 15m height of the loop... and then i tried calculating the centripital force using F=(mv^2)R .... but i cant figure out how to get the downard force of the rails on the car? :(

Any hints? Thanks

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# Roller coaster loop conservation of energy?

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