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Homework Help: Speed of Flywheel

  1. Dec 9, 2007 #1
    1. The problem statement, all variables and given/known data

    In a hybrid vehicle a flywheel is used to capture the energy of the car during braking. If the car has a total mass of 850kg and the flywheel has a mass-moment of inertia equal to 14kgm2 determine the speed of the flywheel when the car stops for traffic lights in an urban area (you may assume 100% efficiency).

    2. Relevant equations

    Not sure

    I am thinking an equation for Uniform Angular Acceleration.


    Centripetal force

    I am stuck on what one to use

    3. The attempt at a solution

    If i can get some hints, i would like to have a stab at this one, i am just 100% lost in Newtons laws and other equations...
  2. jcsd
  3. Dec 9, 2007 #2


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    Homework Helper

    Think of energy. The kinetic energy of the car has to turn into rotational kinetic energy of the flywheel.
  4. Dec 9, 2007 #3
    I will post what i have done in a few hours, thanks for the hint...
  5. Jul 1, 2008 #4
    Hi could you post your results or someone offer some help as i am having problems with the exact same question.

    thank you
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