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What is the magnitude of the upward force of friction

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  1. Mar 7, 2007 #1

    kumar_23

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    :confused: hi guys :eek: :surprised

    please help im really confuzzeled
     
    kumar_23, Mar 7, 2007
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  3. Mar 7, 2007 #2

    cristo

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    Since this is a homework question, please show some work before we can help you.
     
    cristo, Mar 7, 2007
  4. Mar 7, 2007 #3

    kumar_23

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    unknown = a d = v1(time) + 0.5(a)(time)2 ....time is squared
    known
    time= 2.00s a = 1.55m/s/s
    distance = 3.10 m
    v1= 0 m/s
     
    kumar_23, Mar 7, 2007
  5. Mar 7, 2007 #4

    kumar_23

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    this is what i have so far. what do i do after this? plz help
     
    kumar_23, Mar 7, 2007
  6. Mar 7, 2007 #5

    kumar_23

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    can someone help me
     
    kumar_23, Mar 7, 2007
  7. Mar 7, 2007 #6

    hage567

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    Use Newton's second law to sum up the forces. Solve for the frictional force.
     
    hage567, Mar 7, 2007
  8. Mar 7, 2007 #7

    kumar_23

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    help

    what do you mean?
    what am i adding together?
     
    kumar_23, Mar 7, 2007
  9. Mar 7, 2007 #8

    kumar_23

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    i dont understand because right now i have the net force and acceleration.
     
    kumar_23, Mar 7, 2007
  10. Mar 7, 2007 #9

    kumar_23

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    can u please reply? thanks so much for the help =)
     
    kumar_23, Mar 7, 2007
  11. Mar 7, 2007 #10

    hage567

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    What forces are present? Can you tell me that? And their direction.
     
    hage567, Mar 7, 2007
  12. Mar 7, 2007 #11

    kumar_23

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    umm.....there is net force and frictional force and that's it.
     
    kumar_23, Mar 7, 2007
  13. Mar 7, 2007 #12

    hage567

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    No, the net force is the difference between these two other forces. What is causing the kid to go down the pole in the first place?
     
    hage567, Mar 7, 2007
  14. Mar 7, 2007 #13

    kumar_23

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    sorry for the wait. i dont understand what you're asking?
     
    kumar_23, Mar 7, 2007
  15. Mar 7, 2007 #14

    kumar_23

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    "a tree house has a vertical "fire pole" of smooth metal"
     
    kumar_23, Mar 7, 2007
  16. Mar 7, 2007 #15

    hage567

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    I'm asking what forces are acting on the child as he goes down the pole. The is the frictional force, and there is one more. Can you tell me what it is? (What makes things go towards the Earth?)
    Do you know how to draw free body diagrams?
     
    hage567, Mar 7, 2007
  17. Mar 7, 2007 #16

    hage567

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    OK, so you have gravity acting downwards, right? The frictional force acts which way?
     
    hage567, Mar 7, 2007
  18. Mar 7, 2007 #17

    kumar_23

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    Eureka! gravity is the force and yes, i know how to draw FBDs.
     
    kumar_23, Mar 7, 2007
  19. Mar 7, 2007 #18

    kumar_23

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    sorry about the repost.
    frictional force is upwards away from the object
     
    kumar_23, Mar 7, 2007
  20. Mar 7, 2007 #19

    hage567

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    Yes, that's right. So what is your net force then?
     
    hage567, Mar 7, 2007
  21. Mar 7, 2007 #20

    kumar_23

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    frictional force minus gravity (not sure)
     
    kumar_23, Mar 7, 2007
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