## Rolling Resistance Equations

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

Where:

RR = rolling resistance

a = coefficient of rolling resistance

W = vehicle weight

S = speed

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 Blog Entries: 1 Recognitions: Gold Member Science Advisor Staff Emeritus As far as I am aware, rolling resistance is not dependant on velocity or acceleration is is simply given by; $$F_{rr} = \mu mg$$ You may be better posting this in an engineering forum though. ~H
 $$P \approx \frac{Wa}{r}$$ W = weight a = coefficient of rolling resistance r = radius of wheel

## Rolling Resistance Equations

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?

 chck this out http://www.tut.fi/plastics/tyreschoo...t_1/3/3_3.html It talks abt Rolling resistance vs speed