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Roller Coaster

  1. Feb 21, 2008 #1
    1. The problem statement, all variables and given/known data
    The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 37 m diameter loop-the-loop.
    What is the car's speed at the top?

    2. Relevant equations
    I don't know what equation to use

    3. The attempt at a solution
    I honestly don't know what to do...
  2. jcsd
  3. Feb 22, 2008 #2

    Shooting Star

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    Homework Helper

    You have to do something. What's the force called which acts radially inward on a mass going in a circle? And what's the magnitude?
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