Skid To Stop Calculator
The following friction data was taken from “Friction Applications in Accident Reconstruction” by Warner et al. (Society of Automotive Engineers document number: SAE 830612). It has been provided without any warranty as to suitability, accuracy, or usefulness to the user. IBF Investigations International does not endorse this data in any form or its usage and provides it solely as a convenience to the user:
Vehicle Speed Calculator - Skid-to-Stop Analysis
Surface Selection:
| Surface Type: | ||
| Drag Factor Range: | to | Enter or select drag factor range (G) |
Distance:
| d (distance): | meters | Skid Distance in meters for VISIBLE tyre marks |
Formula:
vi = √(ve² - 2ad)
Calculation 1 (Lowest Estimate)
Solution Steps
ve = end velocity = 0.000 m/sec
a = accel / decel rate = -0.500 G = -4.905 m/sec2
d = distance = 30.000 meters
ve = end velocity = 0.000 m/sec
a = accel / decel rate = -0.500 G = -4.905 m/sec2
d = distance = 30.000 meters
vi = √(ve² - 2ad)
vi = √(0² - (2 × -4.905 × 30))
vi = √(0 - (-9.810 × 30))
vi = √(0 - (-294.30))
vi = √294.30
vi = 17.2
vi = initial velocity = 17.200 m/sec = 61.92 km/h
Calculation 2 (Highest Estimate)
Solution Steps
ve = end velocity = 0.000 m/sec
a = accel / decel rate = -0.600 G = -5.886 m/sec2
d = distance = 30.000 meters
ve = end velocity = 0.000 m/sec
a = accel / decel rate = -0.600 G = -5.886 m/sec2
d = distance = 30.000 meters
vi = √(ve² - 2ad)
vi = √(0² - (2 × -5.886 × 30))
vi = √(0 - (-11.772 × 30))
vi = √(0 - (-353.16))
vi = √353.16
vi = 18.8
vi = initial velocity = 18.800 m/sec = 67.68 km/h
Final Results
Final Result (Velocity Range) = —
Final Result (Speed Range) = —
