Speed Decrease as a Function of Distance

Topics related to collision & Trajectory analysis formerly on our 'Registrants only' area however which we get asked about frequently so believe shoud be in the open forum too
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MSI
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Speed Decrease as a Function of Distance

Post by MSI » Sat Oct 17, 2015 12:44 am

Q: I'm looking for a graph of speed reduction per fractional-second to represent how much (or little) deceleration actually occurs during the first 0.5-sec to 1.0-sec. of braking.

A: That brings to mind a figure we created in our McHenry Accident Reconstruction 2008 book (currently out of print).
It does not include time, however it does provide a good illustration of the relationship between speed and distance that you can plug numbers into.
Please note that:
  • In the first 30% of speed reduction, 50% of the total distance to rest is traveled.
  • In 50% of the speed reduction, 75% of the total distance to rest is traveled.
A similar figure could be made for time. [attachment=0]speed decrease at constant decel.png[/attachment]
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speed decrease at constant decel.png
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