Hi All, I know this type of question has been asked many times but I need help to clarify for myself if I'm doing the right thing. So here goes... I am trying to simulate/understand the forces on a vehicle as it is travelling on a road. In particular as it is travelling up hills. So if I have my equations correct the primary negative or braking force would be gravity and would be tangential to the inclined plane. This would be calculated using F = mg sin(ang) So for an inclined plane/road at 10 deg, and a 3000kg vehicle the tangential gravitational force would be F = 3000 x 9.81 x sin(10) = 5110.47 N So is it correct to assume that this force is applied at the wheel contact surface which may have a radius of say 0.2m producing a torque of T = F x R = 5110.47 * 0.20 = 1022.09 Nm So in order to mimic this same force/torque using the car brakes they would need to generate a total negative braking torque of the same amount right? Do I need to bother with speed/momentum in any manner when trying to calculate this braking force as well as the vehicle is travelling up the incline? Thanks for your help!