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Distance travelled of block, friction, forces

  1. Nov 11, 2013 #1
    1. The problem statement, all variables and given/known data
    A block of mass 1kg has a coefficient of static friction of .5. If a 7N force is applied to the block what distance can the block travel? Coefficient of kinetic friction is .3


    2. Relevant equations
    F=ma


    3. The attempt at a solution
    I found the static frictional force to be (.5)(9.8)(1)=4.9N so the Fnet of the initial force applied is 2.1N. However I do not know how to find the distance the block travelled from there? Anybody know how to do this?
     
  2. jcsd
  3. Nov 11, 2013 #2

    adjacent

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    You know the Coefficient of kinetic friction.Thats what you need here.
     
  4. Nov 11, 2013 #3
    I know that I need to use kinetic friction but I don't how to use it with what I am giving. I think I might need to find velocity but how could I find that?
     
  5. Nov 11, 2013 #4

    adjacent

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    (you may redefine the question with "If a 7N force is applied to the block what distance can the block travel?,Until coming to a stop.
    I think your question needs to be a bit clear.
     
    Last edited: Nov 11, 2013
  6. Nov 11, 2013 #5
    Using V^2=u^2+2as, I know that V will be 0, a will be 2.94 and s is the distance which am trying to find, I just don't know how to find u.
     
  7. Nov 12, 2013 #6

    adjacent

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    Make your question clear.A Force of 7N is applied for how many seconds?If we keep applying it forever,it won't stop moving at all.
     
  8. Nov 12, 2013 #7

    haruspex

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    As adjacent implies (now) the question makes no sense as it stands. In the absence of further information, there is no limit on how far it can travel.
     
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