Coefficient kinetic friction and kinetic friction

  • Thread starter IssacChook
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  • #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
 

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  • #2
Chronos
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It wouldn't hurt to know the mass of the cube.
 
  • #3
Sorry, missed out something

the mass of the block is 3.okg
 
  • #4
Delta2
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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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