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Homework Help: Contact force problem

  1. Sep 18, 2007 #1
    1. The problem statement, all variables and given/known data

    A car of mass 8.50E+2 kg and a truck of mass 3.55E+3 kg run into one another due to ice on the road. 60.0 ms after the collision, the car is pushing on the truck with a force whose magnitude is 1.56671E+5 N. Calculate the size of the force on the car due to the truck at that time.

    2. Relevant equations

    accel. of car = accel. of truck
    a = f / sum of masses
    Contact force = mass of truck * (f/sum of masses)

    3. The attempt at a solution

    contact force = 3550 * (15667 / [850 + 3550])

    = 12640 N
  2. jcsd
  3. Sep 18, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Consider Newton's 3rd law.
  4. Sep 18, 2007 #3
    That was too easy. Haha, I feel stupid.
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