Question 1117534
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Hello,


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I know this elementary Physics/Mechanics as good as I know the School Math,  and I would be ready answer your question . . . BUT.


But your question is formulated in a strange way.


The TRADITIONAL question would be about the magnitude of the force directed <U>along the incline</U> 
needed to prevent the block from slipping down the plane.
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Can you confirm, &nbsp;looking into your source, &nbsp;that the problem really asks about HORIZONTAL force in both cases ?


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You may look into the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Vectors/Using-vectors-to-solve-problems-in-Mechanics%3A-Force.lesson>Using vectors to solve problems in Mechanics: Force</A>, &nbsp;&nbsp;Problems &nbsp;3, &nbsp;4 &nbsp;and &nbsp;5

in this site.


Closely related problems were solved there in TRADITIONAL formulation, &nbsp;so you can use them as samples and as approach to your problem.


But if in your problem the force under the question really is horizontal, &nbsp;then the solution requires one more step.


If and then you confirm my request, &nbsp;I will help you to solve your problem.