Circular Motion: Minimum Speed of a Rollercoaster

What forces supply the centripetal force in a vertical roller coaster loop? What's the minimum velocity to make it around the loop?

How fast should a roller coaster be moving at the top to prevent any passengers from falling out?

[Plant]

This a older video but it still helped me through a question or two, thanks!

[ericfeng-ct]

i think the centripial force should be directed towards the radius not away, this is probably a common misunderstanding

[sheepsauruszillarex]

Thanks!, this helped me out a lot! :)

[sentientarugula]

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