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# Mechanics question (equilibrium)

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1. Hi,

In this instance, where do we assume friction between the wall and reaction force of the wall acts? I'm not too sure where to place these forces as the position of these forces will affect my calculation of moments.

Thank you
2. (Original post by dyuunn)

Hi,

In this instance, where do we assume friction between the wall and reaction force of the wall acts? I'm not too sure where to place these forces as the position of these forces will affect my calculation of moments.

Thank you
At the point of contact, I'd assume in the middle of that.
3. It turns out that I can actually solve this question without using torques (just by resolving), but I'm still curious - when we are given these sorts of scenarios where the plane of something is in contact with another surface, where do we assume that the friction/reaction forces act? Or do we never assume, and will questions not require us to know exactly on which point of contact these forces act?

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Updated: October 10, 2016
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