Force Necessary to Start Moving Crate: 167 N

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Homework Help Overview

The discussion revolves around calculating the force necessary to start moving a crate across a rough floor, involving concepts from physics such as friction, forces, and angles. The problem specifies a crate mass of 32 kg, a static friction coefficient of 0.57, and an applied force at an angle of 21°.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the resolution of forces into components, questioning how the angle affects the normal force and the overall calculations. There are attempts to apply the static friction formula and resolve forces, but uncertainty remains about the correct approach.

Discussion Status

The discussion is ongoing, with participants providing guidance on drawing diagrams and resolving forces. There is a recognition of the need to consider both x and y components of the applied force, but no consensus has been reached on the correct method or calculations.

Contextual Notes

Participants note that the normal force does not simply equal the weight of the crate due to the angle of the applied force, indicating a potential misunderstanding of the problem setup. There is also mention of the need for a diagram to clarify the forces involved.

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To move a large crate across a rough floor, you push down on it at an angle of 21°. Find the force necessary to start the crate moving, given that the mass of the crate is m = 32 kg and the coefficient of static friction between the crate and the floor is 0.57.

N=mg=(32)(9.81)= 313.92 * coefficaint of mew sub s=.57=178.9
Ok, I think I did that right...only I'm not sure what to do with the 21° angle. I did 178.9cos(21)=167.0 but that's not right.
 
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Did you draw a diagram with the applied force resolved into x and y components? (BTW, that's where the angle comes in)
Because in this case, N does not equal mg.
 
Like this?
Ny=N
Fky=0
Wy=-mgsin(21
Nx=0
Fkx=-mewk
Wx=0
I did Fk=mewkN=.57*(mgsin(21)=.57*112.5=64.12 I did somthing wrong...again...but I don't know what...
 
where's the force of the push? It has both an x and a y component.
But yeah, that's the sort of chart I had in mind. :grin:
 

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