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A simple question about the concept please come and help

  1. Oct 11, 2009 #1
    What is the greatest acceleration a runner can muster if the friction between her shoes and the pavement is 90% of her weight?
     
  2. jcsd
  3. Oct 11, 2009 #2

    Doc Al

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    What do you think? Hint: Newton's 2nd law.
     
  4. Oct 11, 2009 #3
    I dun really get it, for all I understand is only F=ma...
     
  5. Oct 11, 2009 #4

    Doc Al

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    That's Newton's 2nd law. What's the force?
     
  6. Oct 11, 2009 #5
    the force is net force, so is it just F-the friction= ma?
     
  7. Oct 11, 2009 #6

    Doc Al

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    Yes. The net force is the friction.
     
  8. Oct 11, 2009 #7
    but what is the F in order to minus the friction?
     
  9. Oct 11, 2009 #8

    Doc Al

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    No, the net force is the friction. Just set it equal to ma.
     
  10. Oct 11, 2009 #9
    O....I understand now. Thx for helping...
     
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