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Spinning Object on Flat Surface

  1. Nov 3, 2007 #1
    I'm working on a computer simulation, but I'm not sure how to approach this problem. I want to find the change in angular velocity on an object rotating on top of a flat plane.

    So far this is what I have:
    (* == multiplication not dot product)

    Ff x r = I * alpha
    Ff x r = I * dv/dt

    I can find I, Ff, and dt. I assume Ff x r can be reduced to Ff * r because the friction will always be perpendicular. I don't know what r is though, because the object is flat aren't there a ton of different particles experiencing the Ff? I'm I going to have to integrate all the little Ff x r? I'm pretty lost. Any direction would be wonderful.
  2. jcsd
  3. Nov 4, 2007 #2

    Chi Meson

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    Instead of Ff x r, just use frictional torque, which is what Ff x r is. How would you measure Ff anyway?
  4. Nov 15, 2007 #3
    Thank you very much for your reply.
    I think Ff is what is confusing me. I know the friction coeffecient, and I know how to find the normal. How can I find the friction torque? If ForceOfFriction = NormalForce * FrictionCoeffecient, what does the FrictionTorque = ?
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