Acceleration Resistance
In addition to the forces of resistance resulting from wheel, aerodynamic, and possibly climbing resistance, which arise in a stationary driving condition, in transient driving conditions (v≠const), inertia forces arise as a result of occurring accelerations and decelerations. These inertia forces have to be overcome when the drivetrain of the vehicle is accelerated. The resistances are composed of a:
Translational component, which is produced by the transient motion of the vehicle mass and a
Rotational component, which results from the acceleration or deceleration of the rotating drivetrain components of the vehicle.
The translational share:
The inertia forces when the vehicle accelerates:
FT= -m·ax
The translational resistance force Fa trans thus results to:
 Fa trans = -FT = +m·ax
where: m = mF + mZu
  mF: vehicle mass
mZu: pay-load
ax: acceleration of the vehicle