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Homework Help: Impulse and Linear Momentum

  1. Feb 10, 2015 #1
    1. The problem statement, all variables and given/known data
    A 3500 lb Honda traveling 50 mph west veers into the approaching lane and runs head on into a 10,000 lb truck traveling 45 mph the other way.
    Scenario 1. The two vehicles become 1 (no loss of car parts).
    Scenario 2. The cars separate with the Honda going backwards at 30 mph.

    For each scenario, determine the following:
    1. Initial total momentum
    2. Final velocity of each car.
    3. Impulse acting on each vehicle (delta p)
    4. Assuming the collision impact lasts 0.12 sec. What force acted on each vehicle.
    5. What acceleration did each vehicle endure for the 0.12 seconds.
    6. Make a conclusion about which conclusion is worse?
    7. Determine the KE before and after for each vehicle (assuming no lost mass.)
    8. Determine the amount of KE converted to other forms.
    9. List several forms of energy that could have been increased by the mahem.

    2. Relevant equations
    p = m1v1 + m2v2
    vf1 = m1v1/m1+m2, vf2 = m2v2/m1+m2
    delta p = (m1vf1 + m2vf2) - (- m1vi1 + m2vi2)
    F = m (delta v/delta t)
    a = F/m

    3. The attempt at a solution
    To attempt at a solution, I used the formulas above.

    Also, how does scenario 1 differ from 2?
  2. jcsd
  3. Feb 10, 2015 #2


    User Avatar

    Staff: Mentor

    You'll need to provide more of an attempt than that. We won't do your homework for you here. What calculations and results can you show? Where are you having problems?

    The scenarios differ by the type of collision: Inelastic vs elastic.
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