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Forces Exerted by Seatbelt?

  1. Jun 27, 2012 #1
    1. The problem statement, all variables and given/known data
    A model of an 80 kg man and one of a 25 kg child in a 1000 kg car and secured with seatbelts. The car was moving at 75kph as it crashed into a break wall.If the collision took 0.2s, calculate the average force exerted on each model by its seat belt

    .
    2. Relevant equations
    f=ma


    3. The attempt at a solution
    im really confused, im thinking that for the man: 80x20.8 (75000/3600), the divide by 0.2, so the force is 8333.3 newtons?

    Does the car's weight have anything to do with this?
     
  2. jcsd
  3. Jun 27, 2012 #2

    PhanthomJay

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    Hi Dan, welcome to PF!

    :biggrin:
    Yes
    No.
     
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