Friction and the Coefficents of Friction question

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Homework Help Overview

The discussion revolves around a problem involving static friction, specifically calculating the coefficient of static friction for a box being pushed across a floor. The original poster expresses confusion about the problem and the relevant equations.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants suggest starting with a free body diagram to visualize the forces acting on the box. There is a mention of organizing known information and what needs to be found. Others note that the normal force is equal to the gravitational force in this scenario and that the applied force must equal the frictional force to initiate movement.

Discussion Status

The discussion is in an exploratory phase, with participants providing guidance on how to approach the problem. There is no explicit consensus yet, as participants are still clarifying concepts and exploring different aspects of the problem.

Contextual Notes

The original poster has just started the unit on friction, indicating a potential lack of familiarity with the concepts involved. There may be constraints related to the homework assignment that are not fully articulated in the discussion.

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Homework Statement


so my question is; A horizontal force of 110 N (forward) is required to get a 35 kg box to start moving across a floor, Calculate the coefficient of static friction.
The equations i have been given are Ff=uFn
But I have just started this unit and am so confused. I don't even know where to start.


Homework Equations





The Attempt at a Solution

 
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First, draw a free body diagram for the box - include all forces.
It may help to list what you know and what need to find (organize the info outside of the question).
 
Floor is horizantal so normal force equals gravitational force. To break frictional force, applied force must equal it.
 
1. Three blocks are tied to each other with
two pieces of string, one of which
passes over a frictionless pulley, as
shown. The coefficient of friction
between each block and the surface on
which it slides is 0.2. Just as the
system starts to move, the 3 kg and
6 kg blocks are each one metre away
from the pulley.

1.1Determine the tension in each of the strings.
1.2 How long before one of the blocks jams the pulley?
 

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