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Finding the magnitude of force given acceleration?

  1. Jan 27, 2009 #1
    A 2.4 kg toy locomotive is pulling a 1.3 kg caboose. The frictional force of the track on the caboose is 0.46 N backward along the track. If the train is accelerating forward at 3.1 m/s2, what is the magnitude of the force exerted by the locomotive on the caboose




    Tried doing 3.7(3.1)+.46=11.93
    which equals 12 after sig figs, but it is wrong and I am very confused

    Please help, thanks a lot
     
  2. jcsd
  3. Jan 27, 2009 #2

    LowlyPion

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    Homework Helper

    Welcome to PF.

    The force on the caboose from the locomotive won't involve the mass of the locomotive.

    If the caboose is being accelerated then f = 1.3*a + .46 should be the way to find it.
     
  4. Jan 27, 2009 #3
    Alright thanks a lot
    Appreciate it
     
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