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Math Help - Please Review Mechanics slope problem

  1. #1
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    Please Review Mechanics slope problem

    A body of mass 20 kg is released from rest at the top of a rough slope which is inclined at 30 degree to the horizontal. If the body accelerates down the slope at 3m/s^2, find the resistance to motion experienced by the body. ( Assume this resistance to be constant throughout)
    My answer: Forceof body= mg= 20x9.8
    = 196 N at 30 degree
    Force parallel to the plane = 196x sin30= 98N
    Fnet= Fp-Fr= ma
    98-Fr= 20x-3
    --Fr= -60-98
    = -158N
    Please review and correct me. Thank you very much for your time and help.
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  2. #2
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    Re: Please Review Mechanics slope problem

    if you made the direction down the slope negative ...

    -98 + f = 20(-3)

    f = 38N

    once again ... please post physics problems in the Math Topics forum.
    Last edited by skeeter; October 15th 2012 at 10:50 AM.
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  3. #3
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    Re: Please Review Mechanics slope problem

    Thank you very much Sorry once again
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