Creates a model for sides track apart with a slip factor, 1 unless given; each
magnitude is used, and a slip of 0 is taken as 1.
Optionalslip: number | nullReturns the forward speed and yaw rate measured side speeds make.
Returns the left and right speeds for a forward speed and a yaw rate.
A tracked or four-wheel drive that turns by skidding, with its track widened by a slip factor.