What kind and value is the friction coefficient of tank tracks on the move, when force is applied forward in the direction of the tracks movement? Is the friction coefficient in that case, closer to kinetic/sliding coefficient or to a rolling resistance coefficient? What about the sideways friction coefficient of rolling vehicles ? Do the same values of resistance apply in both the direction of movement as well as sideways force? Do the sideways resistance of a moving vehicle and the rolling resistance in the direction of moving have the same value or is the sideways resistance, closer to kinetic/sliding resistance? How big is the difference between the friction coefficient of wheeled vehicle in direction of movement and the sideways coefficient of that vehicle? What is the difference in value of this sideways friction coefficient between tank tracks and car wheels? Here is the same question articulated differently: Say we have 2 vehicles: A 4 rubber wheel car and a tank with 2 rubber track treads. Both weight is 1000kg, both motor and gear are held in 'neutral', both of these vehicles are moving on the same asphalt road. From a table i have here, i see that a typical rolling resistance of rubber on asphalt is 0.05. This means that in order to make the car move forward, i need to push it forward at a force equal to about 50kg. What about the tank? What would be the force needed to apply forward on the 1000kg tank, in order to make it move? Now sideways: if that 1000kg car is moving at 0.1 m/s on an asphalt road, what is the force needed to move it sideways? Now at 10 m/s would the sideways friction coefficient be the same? is it calculated according to kinetic/sliding coefficient or according to other type of coefficient? Is there influence on kinetic/sliding coefficient, when pushing a car moving forward sideways, as a result of the fact that it is moving forward at the same time? If there is such an influence on kinetic/sliding coefficient value, what is the scale of it? How does it change when dealing with tank treads, instead of car wheels?