Quote:
Originally Posted by Boreas
Is the term g ,in the rolling resistance equation essentially one, on the on the surface of earth. With minor variations due to elevation that are small enough to be ignored for fuel economy purposes?
|
g, acceleration due to gravity, varies in a minuscule fashion with elevation. Variations in the strength of the Earth's gravitational field at its surface are generally of interest to physicists, but not engineers. g=9.8m/sē will get you two significant figures, which is more than you have for the rest of your inputs anyway.
>Is wind resistance an exponental equation due to the v squared term and the rolling resistance equation linear with constant slope due to v or no other them being squared?
I'm not clear on what you're asking here. The force of aero drag rises exponentially with speed, while rolling resistance... well, see the graph I just posted. According to the simplified model, it's independent of speed.