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3. i understand the basic steps of summing the forces in...

# Question: i understand the basic steps of summing the forces in...

###### Question details

I understand the basic steps of summing the forces in the x-direction and the y-direction, then taking a moment around a point. However, I would really appreciate some clarification on how we know which forces to include in the moments/summations. In other walk throughs, they only include certain forces, for reasons I am not aware of.