Coefficient of static friction

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Homework Help Overview

The discussion revolves around a physics problem involving the coefficient of static friction for an apple crate weighing 49N, which is subjected to a force of 20N at an angle of 19 degrees. Participants are attempting to analyze the forces acting on the crate as it accelerates at 0.5m/s².

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are discussing the setup of the problem, including the forces in the x and y directions. There are attempts to relate the applied force and weight to the coefficient of static friction, with some questioning the accuracy of their calculations compared to the book's answer.

Discussion Status

There is an ongoing exploration of the problem, with some participants noting discrepancies between their results and the expected answer from the textbook. Several have recalculated their results, leading to different conclusions, and there is a recognition of the importance of setting forces equal to zero for a system in equilibrium.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information they can use or the methods they can apply. There is also a reference to a previous similar problem that may influence their approach.

hannsparks
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An apple crate with weight of 49N accelerates at 0.5m/s2 along a horizontal a force of 20N apllied above the horizontal at 19 degrees is required to bring the crate on the verge of motion. Find the coefficient of static friction between the crate and the surface.

-usn+20 cos 19 x direction
N+W+20 cos 19 y direction

F=ma F=5x0.5
F=2.5

don't know what to do next..please help
 
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I did it exactly the way I did the other problem but according to the book the answer should be 0.445 but I am getting 0.386
 
i don't know what I am doing wrong I don't thnik the book is wrong it says 0.445 and I got 0.386 like 4 times in a row
 
I got .386 too. But that is not to say that I didnt do anything wrong either, but it is a good sign we both got the same answer.
 
I redid the question and I got 0.445 I forgot to set fx and fy equal to zero because the crate is not in motion it is on "the verge of motion"
 

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