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Pressure on tyres of a vehicle question - Calculating weight

  1. Oct 1, 2013 #1
    1. The problem statement, all variables and given/known data

    The pressure in the tyres of a vehicle is 280 kPa. The contact area of each of the four tyres on the ground is 0.012m^2. Calculate the weight of the vehicle.

    2. Relevant equations

    Force = Pressure x Area

    3. The attempt at a solution

    280 kPa = 2800000 Pa

    Force = 2800000 x 0.012 = 33,600N

    Am I right in assuming that this is the weight of one tyre, so you have to multiply this by 4 to get the force of the whole vehicle on the ground??

    I think I've gone completely wrong here so would be grateful for some help!

    Thanks :-)
  2. jcsd
  3. Oct 1, 2013 #2


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    Double check your conversion of 280 kPa to Pa.
  4. Oct 1, 2013 #3
    Oops - wouldn't it be 280,000 Pa?
  5. Oct 1, 2013 #4

    I like Serena

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    That looks better! :smile:
  6. Oct 1, 2013 #5
    So my method was correct??
  7. Oct 1, 2013 #6

    I like Serena

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  8. Oct 1, 2013 #7
    Yay! Thank you very much!!
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