Average crush force exerted on a car

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SUMMARY

The average crush force exerted on a car can be calculated using the formula Average Crush Force = mv² / 2d, where m represents the mass of the car in kilograms, v is its velocity in meters per second, and d is the distance over which the force is applied. This relationship is derived from the kinetic energy equation, Ke = (1/2)(mv²), indicating that all kinetic energy is converted into work during the crushing process. The work done on the object can be expressed as W = Fd, confirming the validity of the average crush force formula.

PREREQUISITES
  • Understanding of kinetic energy and its formula: Ke = (1/2)(mv²)
  • Basic knowledge of work and force relationships in physics
  • Familiarity with the concepts of mass, velocity, and distance
  • Ability to manipulate algebraic equations to derive formulas
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Students studying physics, automotive engineers, and safety analysts interested in understanding the dynamics of vehicle collisions and crush force calculations.

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Homework Statement


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Homework Equations


Kinetic energy = Ke = (1/2)(mv^2) (joules - J)
where m = mass (kg)
v = velocity (m/s)

The Attempt at a Solution


What I was thinking was that the kinetic energy is divided uniformly over the distance d and hence
Average crush force = mv^2 / 2d

But I don't know how to prove that. Of course I could try to explain it with words, but I don't feel that it is enough.

Thank you in advance.
 
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All of the KE is converted to work in crushing things: W = Fd = 1/2*m*v^2
 
thank you, very helpful!
 

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