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Math Help - Friction (check my answer)

  1. #1
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    Exclamation Friction (check my answer)

    An 80N wooden block is placed on top of a wooden table.If a force of 28N is necessary to keep the block moving at a constant velocity.
    a)What is the co-efficient of sliding friction for the wooded block?
    b)if a wieght of 40N is placed on top of the wooden block what force will be required at a constant velocity across the table?

    Attempt:
    a)  u=\frac{f}{N}
    f=28 , N=80
     \frac{28}{80}=0.35
    b)80*28=120*x
     x=\frac{80*28}{120} =18.7N

    Am I correct?
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  2. #2
    Super Member malaygoel's Avatar
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    first part is correct, second part is incorrect.

    Hint: Since N has increased, f has to increase
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