Static friction and kinetic friction

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Homework Help Overview

The discussion revolves around a problem involving a chuck sliding down an inclined plane with friction, where the angle of inclination is 26 degrees and the initial and final velocities are provided. The participants are tasked with finding the coefficients of static and kinetic friction in this context.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to determine acceleration and suggest drawing a free body diagram while applying Newton's second law. There is uncertainty about the necessity of knowing the mass of the chuck and how to proceed without it.

Discussion Status

Some participants have offered guidance on how to approach the problem, including the suggestion to treat mass as a variable. Others have pointed out potential errors in algebra and emphasized the importance of correctly applying trigonometric functions in calculations.

Contextual Notes

There are references to guidelines for posting homework questions, indicating that participants are encouraged to follow a structured approach when seeking help.

salmacho
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A chuck is sliding downward an inclined plane with friction. The inclined plane has an angel 26 degrees with the horisontal. At a point the chuck has a velocity 4 m/s. The velocity after 2 seconds goes down to 2 m/s. The g is applied to 9.81 m/s^2.

So from here I need to find the kinetic and static friction. The problem for me is that I don't know where to start. When I try do find Fx and Fy, I need the mass, so which way should I go through?

Thanks! :)
 
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You won't need the actual mass. Just call it "m" and continue.

What does the problem ask you to find? The coefficient of kinetic friction?
 
Doc Al said:
You won't need the actual mass. Just call it "m" and continue.

What does the problem ask you to find? The coefficient of kinetic friction?

The problem wants me to find the coefficient between the chuck and the inclined plane
 
salmacho said:
The problem wants me to find the coefficient between the chuck and the inclined plane
Good.

(1) Figure out the acceleration.

(2) Draw a free body diagram and then apply Newton's 2nd law.
 
salmacho said:
Where am I doing wrong? Please correct me
Redo your algebra. You dropped a factor of g.
 
salmacho,
Please, when you get a chance, read the guidelines for posting homework questions and use the template.
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