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Static Equilibrium of an automobile

  1. Mar 13, 2008 #1
    1. The problem statement, all variables and given/known data

    An automobile with a mass of 1360 kg has 3.05 m between the front and rear axles. Its center of gravity is located 1.78 m behind the front axle. With the automobile on level ground, determine the magnitude of the force from the ground on a) each wheel (assuming equal forces on the front wheels) and b) each rear wheel (assuming equal forces on the rear wheels).

    2. Relevant equations

    Forces up = forces down
    Forces to the right = forces to the left
    Net torque clockwise = net torque counter-clockwise

    In other words, net force = 0

    3. The attempt at a solution

    N = mgr
    a) r being the distance from the front axel to the center of gravity
    b) r being the distance from the center of gravity to the rear axel

    Is this correct?
    I sort of drew a picture, but I'm not able to scan it at the moment.
  2. jcsd
  3. Mar 13, 2008 #2
    N=mgr is incorrect. Write out the units for that equation and see what you get. What units do you need?

    I suggest you draw your free body diagram in Microsoft paint or something so that you can post it. This type of problem becomes extremely simple with the correct free body diagram.
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