Solving Frictional Force: Find Ff & Kinetic Friction Coefficient

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Homework Help Overview

The discussion revolves around determining the frictional force and the coefficient of kinetic friction for a box subjected to an applied force and resulting acceleration. The subject area includes concepts of dynamics and friction in physics.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to find the frictional force by calculating the net force using F=ma and then subtracting it from the applied force. They express confusion regarding a different method presented in their textbook. Other participants discuss the relationship between net force, applied force, and kinetic friction, suggesting manipulations of the equations involved.

Discussion Status

The discussion is active, with participants exploring different interpretations of the problem and the methods used to arrive at the frictional force. Some guidance has been offered regarding the relationships between forces, but no consensus has been reached on the correct approach.

Contextual Notes

Participants are considering different methods for calculating the frictional force and the coefficient of kinetic friction, highlighting potential discrepancies between their approaches and the textbook's method.

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[SOLVED] URGENT---Frictional force

A force of 1.6N is applied to a box of mass 1.8Kg. It accelerates 0.6m/s^2. Determine Ff and the coefficient of kientic friction.

K so I knoe how to do this. But in the textbook, it has been done in a different way.

So what I did is Found the net force using F=ma.
Then i subtract from 1.6 and get Ff.
Then use the formula mk= Ff/Fn

In the book they took Ff=ma
Which is the right solution?
 
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Well [itex]F_{net}=F_{applied}-F_k[/itex] where [itex]F_k[/itex] is the force due to kinetic friction. So with a bit of manipulating one can see that the friction force will be the applied force minus the net force which can be worked out from the acceleration of the block.
 
And fnet is MA
 
pinkyjoshi65 said:
And fnet is MA

Yes.
 

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