Column J : Acceleration force Newtons. This is the resultant force acting on the car
(the vector addition of the forces acting in the direction of motion).
It will cause acceleration if positive or deceleration if negative.
= $M20+$H20-$F20-$G20
Column K : Acceleration in m/s/s this is the acceleration caused by the force above.
=$J20/$B$7
Column L : A shift register created to allow the logic statements to control only
one change of gear ratio.
=IF($D20>=$D$11,1+L20,0+L20)
Column M: Wheel slip drive force, this is the force at which the drive wheel slips on the
track we compare the motor drive force to this force and use the lower value
in determining the acceleration force in column J.