# What is the minimum frictional force required for a vehicle to operate smoothly, retain traction, and prevent any skids?

I am not looking for a specific number of course. I know that it may perhaps vary with different vehicles. However, I'm trying to figure out how to theoretically calculate the minimum necessary frictional force. In other words, what variables determine how much kinetic frictional force is required to maintain traction?

I am not asking for how to find frictional force, but how to know whether a vehicle can or cannot operate on certain roads with varying coefficients of kinetic friction.

I guess a main "sub-question" would be is min. friction requirement independent or dependent of mass?

In other words, do smaller vehicles which lesser mass have smaller min. friction requirements than bigger vehicles? Is it really determined by mass or rather the normal force, which can change in magnitude in an incline?

As an example, can a truck travel with sufficient traction with the same min. frictional force required for a bicycle?

Is there an equation relating mass or normal force to determine the min. frictional force required?