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Homework Help: Newton 2nd law, forces and vectors

  1. Jul 10, 2012 #1
    A car of mass 1000 kg tows a caravan of mass 600kg up a road which rises 1m vertically for every 20m its length.
    There are constant frictional forces of 200N and 100N to the motion of the car and caravan respectively.
    the combination has an acceleration of 1.2ms-2 with the engine exerting a constant driving force.
    Find a. the driving force
    b. the tension in the tow bar

    i have the sol'n for part a
    no clue for part b
    will post my progress below
  2. jcsd
  3. Jul 10, 2012 #2
    part a
    using g as 10

    f = ma
    (1000 + 600)(1.2)

    F component paralled to plane inclined
    (1600)(10) Sin∅

    driving force

    part b
    1920 - 800

    Last edited: Jul 10, 2012
  4. Jul 10, 2012 #3


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    Homework Helper

    The force of the tow bar pulls the caravan. Find the resultant of all forces exerted on the caravan. You know its acceleration.

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