- #1

joker2014

- 21

- 0

## 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 ... I am confused when to take negative or position... so why not -200 or -125 [/B]

Last edited: