Are Rolling Resistance Equations for Speed and Acceleration Accurate?

[Ideologue]

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

 

[Hootenanny]

As far as I am aware, rolling resistance is not dependent 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

 

[Cyrus]

$$P \approx \frac{Wa}{r}$$

W = weight
a = coefficient of rolling resistance
r = radius of wheel

 

[Ideologue]

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?

 

[Jaishankar]

chck this out

http://www.tut.fi/plastics/tyreschool/moduulit/moduuli_8/hypertext_1/3/3_3.html

It talks abt Rolling resistance vs speed