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## Homework Statement

4-70 Two couples act on the beam. If F=125 lb. determine the resultant couple moment.

## Homework Equations

M=Fd

## The Attempt at a Solution

I know CW is + and CCW is - ...and that is determined in the final answer,

I know the solution is taking Forces times the distance, the solution is M=(200*1.5)+(125cos30*1.25)

question is why are they both positive? when do we consider taking negative instead positive? i've seen other solutions for other questions, where they take negative ... im confused when to take negative or position... so why not -200 or -125 [/B]

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