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Force problems

  1. Feb 15, 2008 #1
    [SOLVED] force problems

    A 7.79 kg toy car now starts at rest and is going around a circular track of radius 38.5 m, the accelerates at a constant rate to a final speed of 5.13 m/s in 6 seconds. At the instant it reaches its final speed, find:1.the magnitude of the inward force needed to keep it moving in a circle
    2.the magnitude of the tangential force


    question1. F=mv2/r=7.79(5.13)(5.13)/38.5=5.32. and that's is right.
    question2. the magnitude of the tangential force, i dont know what to do with it ,can anybody help me?
  2. jcsd
  3. Feb 15, 2008 #2


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    The tangential force problem is the same as a linear force problem. 0->5.13m/sec in 6sec. How much force?
  4. Feb 15, 2008 #3
    thank you for help. i got the answer.
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