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Homework Help: Newton's 2nd law problem

  1. Oct 3, 2014 #1
    The problem states that a 3.4 kg object hangs at one end of a rope that is attached to a support on a car. The car and cruisin' and is accelerating, when it does this, the rope makes an angle of 23 degrees with the vertical. Acceleration of gravity is 9.8 m/s/s and the question is asking for the car's acceleration. A rad diagram for your visual 15432303272_773355a70a_b.jpg
    Σf= ma
    Probably something with trig functions (sin, cos, tan)

    The first thing I did was multiply the mass 3.2 kg by gravity 9.2 m/s/s
    That gave me a force of 31.36N, now, how do I use this to find the cars acceleration. I just don't see a correlation.
  2. jcsd
  3. Oct 3, 2014 #2
    Welcome to PF GovernorBob.
    Do you know what is pseudo force?
    The problem will be easier to solve if you consider a reference frame which is moving with the car and visualize the motion of that hanging mass wrt to that frame.
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