Calculate the average force exerted on the driver by the seat belt

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Homework Help Overview

The problem involves a car collision scenario where the driver is brought to rest by a seat belt. The context includes calculating the average force exerted on the driver, comparing this force to the driver's weight, and determining the 'g-force' experienced during the crash.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to use the equation F = m(v - u)/t to find the average force. They also question whether the work done formula can be used to calculate 'g-force' and express uncertainty about the relationship between 'g-force' and potential energy.
  • Some participants confirm the approach regarding average force and clarify the concept of 'g-force' as a ratio of acceleration to gravitational acceleration.
  • There are repeated inquiries about how to calculate 'g-force'.

Discussion Status

The discussion is actively exploring the calculations related to average force and 'g-force'. Some guidance has been provided regarding the relationship between force and weight, but multiple interpretations and questions remain, particularly concerning the calculation of 'g-force'.

Contextual Notes

The problem may involve assumptions about the collision dynamics and the definitions of terms like 'g-force' and potential energy, which are currently under discussion.

terainfizik
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Homework Statement


A car is involved in a collision when it is traveling at 24m/s. The driver , of mass 85kg, is brought to rest by the seat belt in a time of 400 ms . Calculate the average force exerted on the driver by the seat belt . Compare this force with his weight , and hence calculate the 'g-force' to which he's subjected by the crash, and comment on the likelihood of his sustaining serious injury.


Homework Equations





The Attempt at a Solution


Well, I' use F=m (v-u)/t to find the average force exerted on the driver, am I correct ? Second question , can I use formula of work done to calculate the 'g-force' ? Logically, is it impossible the 'g-force' means the potential energy stored in the car ? Guide me please .
 
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F = ma so you are on the right track with the first part. "g-force" just means the ratio of the acceleration to gravitational acceleration, which is the same as the ratio of force to weight. We commonly say a force is "7 Gs" if a force on an object is 7 times its weight.
 
Last edited:
'g-force' , how 'd i calculate ?
 
terainfizik said:
'g-force' , how 'd i calculate ?

He just explained : g force is the ratio of acceleration to gravitational acceleration.


marlon
 

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