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Finding out the horizontal force required to make an object move.

  1. Jan 25, 2012 #1
    1. The problem statement, all variables and given/known data
    An ice fishing hut weighing 52 N sits on a dry, frozen lake.
    What is the magnitude of the initial horizontal force required to make the ice fishing hut start sliding across the surface of the frozen pond



    2. Relevant equations
    μk = Fk/Fn or μs = Fs/Fn


    3. The attempt at a solution
    Find out Static Friction

    Fnetx = FA + FS
    Get rid of vectors so it rearranges to...
    -FS + FA or FA - FS
    See if m*a is equal to the Fnet
    ma = -FS + FA
    No mass or acceleration is given so I am unaware on how to discover the applied force which in turn would allow me to get the Static friction(max)
     
  2. jcsd
  3. Jan 25, 2012 #2

    Simon Bridge

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    Welcome to PF.

    Are you not told the weight of the hut?

    Note:
    http://www.u-picardie.fr/~dellis/Documents/PhysicsEducation/The%20coefficient%20of%20friction.pdf [Broken]
    ... not sure how you are expected to find the coefficient of static friction: look it up?
     
    Last edited by a moderator: May 5, 2017
  4. Jan 25, 2012 #3

    PhanthomJay

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    The mass of the hut can be determined from its weight. But what is more important to know is the static coefficient of friction between the hut and ice. The hut will move and accelerate when the applied force exceeds the max static friction force. If the ice is considered frictionless, it'll move with the slightest breath.
     
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