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Homework Help: Tractive Force

  1. Jun 12, 2017 #1
    Hi All,

    I've been asked to re-work the below as my original method was incorrect.

    Below is my second attempt on the question, which I would appreciate some input from someone a more knowledgable than myself.


    1. The problem statement, all variables and given/known data

    A racing car of mass 850 kg accelerates from 20 km/h to 160 km/h over a distance of 300 metres. Frictional forces and wind resistance can be assumed to be 800N.

    Determine the following:

    (iii)The tractive force produced by the car to provide this acceleration

    2. Relevant equations


    3. The attempt at a solution


    a=3.24 m/s2

    Force = 3.24 * 850 = 2754 joules

    Tractive Force = Force + Frictional Forces
    3554 = 2754 + 800
  2. jcsd
  3. Jun 12, 2017 #2


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    Homework Helper
    Gold Member

    I haven't checked your numbers, but your method is correct.
  4. Jun 12, 2017 #3


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    Science Advisor
    Homework Helper
    Gold Member

    Typo - missing sign.
    Wrong units.

    The numbers all look right.
  5. Jun 18, 2017 #4
    Thanks. I had newtons wrote down, Just typed the answer here wrong.
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