Forces in Car Crashes




Force on car Calculation of force on car Example of force on driver
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Example of Force on Car




(This initial example is cast in U.S. common units because most U.S. readers can make comparisons to known forces more easily in those terms. The calculation provides the results in SI units as well.)

Vary the parameters of the collision

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Calculation of Force on Car




If the weight of the car is N = lb, corresponding to
mass = kg = slugs,
and the car is traveling with a speed:
v = m/s = km/hr = mi/hr,
then a crash which stopped the car in a distance d=m = ft
would result in an average impact force of

Impact force F = N = lb = tons!!

You may change any data value. Clicking outside the box will then initiate a calculation of the impact force and conversion of the data value to the other types of units.

Discussion of car crash scenario

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Work-energy principle
 
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