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Coefficient kinetic friction and kinetic friction

  1. Jul 14, 2014 #1
    Hi guys, i have some questions regarding Frictional Force that came up in a book.
    If the cube moves throgh a distance of 4.0m in 2.0s, find the kinetic friction and coefficient kinetic friction between the cube and the plane. ( coefficient of static friction force Us= 0.466, angle of incline= 25) , how to solve it? Thanks
     
  2. jcsd
  3. Jul 14, 2014 #2

    Chronos

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    It wouldn't hurt to know the mass of the cube.
     
  4. Jul 15, 2014 #3
    Sorry, missed out something

    the mass of the block is 3.okg
     
  5. Jul 15, 2014 #4
    You can calculate the acceleration a of the block by using the formula [tex]s=(1/2)at^2[/tex] where s=4.0m, t=2.0s. Then you should calculate all the forces acting on the x-axis (axis parallel to the incline) which are the kinetic friction T and component of weight on the x-axis [tex]B_x[/tex]. It will be [tex]B_x-T=ma[/tex] where m the mass of block and a the acceleration you calculated on first step. From the last equation you ll be able to find the coefficient and the kinetic friction T.
     
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