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Homework Help: Dynamics Question Grade 11 Level

  1. Jan 23, 2010 #1
    1. The problem statement, all variables and given/known data

    A parachutist experiences an air friction force of 150 N and an acceleration of 7.9 m/s^2. What is the combined weight of the parachutist and the parachute?

    2. Relevant equations


    3. The attempt at a solution

    a= (Fg-Ff)/(m)

    7.9 = (mg-Ff)/(m)

    7.9 = (m(9.8)-(150N))/(m)

    And that is as far as I could go. I thought I was using the right formula but I do not know for sure. Thanks.
  2. jcsd
  3. Jan 23, 2010 #2


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi kylepetten! Welcome to PF! :wink:
    Looks good!

    Now multiply both sides by m (hmm … why did you ever divide in the first place? :confused:), and rearrange. :smile:
  4. Jan 23, 2010 #3
    Re: Welcome to PF!

    Thank-you for welcoming me here! I hope to be able to both get help and help people when my physics knowledge improves. And even more thanks for helping me understand this question! :) Much Appreciated.
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