- #1

hsphysics2

- 27

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## Homework Statement

Find the normal force in terms of g, m, θ and α. There is no friction. a=0, θ≠α

See first attachment for diagram

## Homework Equations

F

_{x}=ma

_{x}

## The Attempt at a Solution

I drew a free body diagram including the forces; normal, mg, and |F

_{A}| (See second attachment) I'm not sure if this is complete as I don't know where α would be part of it.

However I did start with this,

η-mgcosθ=0

η=mgcosθ

mg=η/cosθ (eq'n 1)

F

_{x}=ma

_{x}

|F

_{A}|-mgsinθ=ma

_{x}(sub eq'n 1 in)

|F

_{A}|-(η/cosθ)sinθ=ma

_{x}

|F

_{A}|-(ηsinθ/cosθ)=ma

_{x}