This calculator is used to calculate the effective coefficient of friction over the distance d when no braking is applied.
The angle B may be greater than 360° for a spinning vehicle. Note that B is measured from the heading direction at the first selected point.
Select two points on the path taken by the vehicle. Measure the angle of yaw or the total angle of spin, A°, at the first point. At the second point, measure the angle of yaw or spin, B°, with respect to the direction of heading at the first point.
Fill in the four boxes below, then click the Calculate button.
Angle A (degrees):
Angle B (degrees):
Actual coefficient of friction:
Coefficient of rolling friction:
Effective coefficient of friction =
Based on the side slip calculations for a yawing or spinning vehicle from B. T. Nightingale, Accident Reconstruction of Rollovers - a methodology, Impact, 17, 2, 2009.
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