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Homework Help: Rolling Resistance Equations

  1. May 22, 2006 #1
    Are these simple equations correct?

    For rolling resistance force at a given speed:

    RR = aWS

    For rolling resistance force at a given rate of acceleration:

    RR = aWS^2


    RR = rolling resistance

    a = coefficient of rolling resistance

    W = vehicle weight

    S = speed
  2. jcsd
  3. May 22, 2006 #2


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    Staff Emeritus
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    As far as I am aware, rolling resistance is not dependant on velocity or acceleration is is simply given by;

    [tex]F_{rr} = \mu mg[/tex]

    You may be better posting this in an engineering forum though.

  4. May 22, 2006 #3
    [tex] P \approx \frac{Wa}{r} [/tex]

    W = weight
    a = coefficient of rolling resistance
    r = radius of wheel
  5. May 22, 2006 #4
    Thank you both for your replies.

    I have read that rolling resistance does increase with speed, but I have read a lot of confusing and contradicting information on this issue. That is why I now seek clarification. Engineering forum posting is a good idea.

    Cyrus’, I am not entirely sure how to use your equation. I admit that I am at a very basic level and I am (due to reading pages of contradicting information from people with negative teaching ability) in a state of high confusion! Please could you explain it and perhaps state where you learned it?
  6. May 12, 2011 #5
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