Coefficient kinetic friction and kinetic friction

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Discussion Overview

The discussion revolves around calculating the kinetic friction and the coefficient of kinetic friction for a cube moving down an incline. Participants explore the necessary steps and formulas needed to solve the problem, including the role of mass and acceleration in the calculations.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant asks how to find the kinetic friction and coefficient of kinetic friction given the distance, time, static friction coefficient, and incline angle.
  • Another participant suggests that knowing the mass of the cube is essential for solving the problem.
  • A later reply provides a method to calculate the acceleration using the distance and time, and outlines the forces acting on the block, indicating a relationship between the forces and the mass and acceleration.

Areas of Agreement / Disagreement

Participants generally agree on the need for the mass of the cube and the approach to calculate acceleration, but the discussion remains unresolved regarding the exact calculations and final values for kinetic friction and the coefficient.

Contextual Notes

The discussion does not address potential limitations or assumptions in the calculations, such as the effects of the incline angle on the forces involved.

IssacChook
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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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It wouldn't hurt to know the mass of the cube.
 
Sorry, missed out something

the mass of the block is 3.okg
 
You can calculate the acceleration a of the block by using the formula s=(1/2)at^2 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 B_x. It will be B_x-T=ma 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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