Kinetic and Static Friction Problems

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Homework Help Overview

The discussion revolves around a problem involving kinetic and static friction, specifically analyzing the motion of a plate sliding across a surface and the forces acting on it. The original poster seeks assistance in calculating the force of friction and the coefficient of kinetic friction.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between force, mass, and acceleration, suggesting that the known values can be used to calculate the force of friction. There are inquiries about the use of free-body diagrams and Newton's second law to analyze the forces involved.

Discussion Status

Some participants have provided guidance on using fundamental physics principles to approach the problem, including the suggestion to calculate acceleration and consider the forces acting on the plate. Multiple lines of reasoning are being explored, but there is no explicit consensus on the steps to take.

Contextual Notes

The original poster expresses uncertainty about how to begin the calculations, indicating a possible gap in understanding the application of the concepts involved.

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Kinetic and Static Friction Problems Please Help!

Mr. Bob slid a 250g plate 1.35m across the dish return counter. It slowed with a constant acceleration for 0.85s before coming to a stop.


a) Find the magnitude of the force of friction

b) What is the coefficient of kinetic friction between the plate and the counter?

(I have no idea how to do a. but if I have a. I'll know b.)
 
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What is the relationship between force, mass, and acceleration? You know the mass and the acceleration, so you can calculate the force using that relationship.
 


I know that is the direction I have to go but the answer has been alluding me. Could you please show me how to get the magnitude of friction!
 


Have you drawn a free-body diagram for the plate?
Look at the forces in the x-direction (only friction), and use Newtons's second law.
Have you calculated the (constant) acceleration of the plate?
 

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