1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Problem CAR

  1. Jun 28, 2009 #1
    A car of 1200 kg pull a trailer of 1050 kg. The set is moving at 90 km/h suddenly suffers the action of the brakes. Knowing that the forces of officers in the car brakes on the trailer and worth 4500N and 3600N, respectively, determine (a) the deceleration of the joint and (b) the horizontal component of force exerted by the trailer on the car

    I think:

    Car

    ZFx = mc . a
    -Ftc = mc . a

    Trailer

    ZFx = mt . a
    Ftc = mt . a


    But not possible to calculate
     
  2. jcsd
  3. Jun 28, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    What is the deceleration of the combined system?

    ∑F = (∑m)*a

    a = ∑F/∑m

    Then, knowing the deceleration of the whole, draw a force diagram to figure the forces between the parts.
     
  4. Jun 28, 2009 #3
    Thank you.

    a = (4500+3600)/(1200+1050) = 3,6 m/s^2

    Break + F = mB . a
    F = (1050 x 3,6) - 3600
    F = 180 N
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Problem CAR
Loading...