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## Main Question or Discussion Point

Hi! Well, I'm programming a vehicle's physics, and I have trouble finding a way to calculate Rolling resistance, though i searched a lot. I already have the Traction Force and the Drag Force, but now I need Rolling Resistance. The best thing i found is that Froll = Croll * P, where Croll is the coefficient of rolling and P is the weight of the vehicle, in Newtons. I found info and I made a table for the coefficient being, for example, 0.011 for concrete roads, 0.3 for sand etc, and I have 3 rows for 3 types of wires. The problem, I cannot find how to fit Velocity in the formula.

When going for a 0.011 coefficient the simulation seems to work, but when i choose 0.3, Rolling resistance becomes greater than Traction one, and the vehicle runs backwards before even starting to accelerate. Rolling resistance should start at 0, and increase until the final value as the speed increases, or something like that, but i cannot find any data! I even found people saying that the rolling resistance is 0, and then it jumps to the value after a certain speed threshold, but that sounds weird to me...

When going for a 0.011 coefficient the simulation seems to work, but when i choose 0.3, Rolling resistance becomes greater than Traction one, and the vehicle runs backwards before even starting to accelerate. Rolling resistance should start at 0, and increase until the final value as the speed increases, or something like that, but i cannot find any data! I even found people saying that the rolling resistance is 0, and then it jumps to the value after a certain speed threshold, but that sounds weird to me...