Hello guys, I would like to help me with rolling friction on a car(i am building a project that simulates the forces applied to a vehicle when it moves on a straight road http://rapidshare.de/files/40862186/Vehicle_Sim.zip.html). So: Engine has a torque at some RPM,and the torque goes to the wheels with gearbox.If car weights 1000kg,and rolling friction coefficient is 0.03, then total friction force for all 4 wheels is 1000*9.81*0.03=294N. 1)what happends if torque on wheels from engine in certain RPM is 190N (<=294)?friction then is 0 or 190 or 294? 2)friction depends on speed? 3)when a apply brake,and brakes make car slows down with acceleration=9m/s^2,friction force changes direction? 4) if friction is 294N and car speed=0,and driver presses acceleration pedal but the torque on wheels is only 100N, the car will never roll? thanks a lot!